# Strange end ("Double D"? GM?) on a strut rod **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** beetle, volkswagen\ **Created:** [April 18, 2020, 12:59am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015 "2020-04-18T00:59:56Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Will-Parker](https://avatars.discourse-cdn.com/v4/letter/w/b5a626/32.png) [@Will-Parker](https://community.cartalk.com/u/Will-Parker)\ **Post date:** [April 18, 2020, 12:59am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/1 "2020-04-18T00:59:56Z")
Anyone with experience using “Double D” endings on strut rods? (Aka GM Shock Absorber tool?) I tracked down a tool online (link below) that seems to resemble the ends of my strut rods, but there aren’t any specs given anywhere. Do these come in multiple sizes?? I believe I need one that is 7 or 8 mm wide. I saw one online labeled as 7.5 mm wide?? Just trying to get new struts on my VW beetle and very confused about this. > **[CTA Tools A430 GM Shock Absorber Socket](https://www.jbtools.com/cta-tools-a430-gm-shock-absorber-socket/?gclid=CjwKCAjwp-X0BRAFEiwAheRuixAd_SqXAfVHAu2vawgHRG7JHRj5Ozr5NlkCzVru6gCdYC49WYaGSxoCydIQAvD_BwE)** > > Buy CTA Tools A430 GM Shock Absorber Socket with an everyday low price and fast shipping! JB Tools LONG VERSION: 1998 VW beetle, TDI Manual, 240k Went to change out some very worn struts, but the nut at the top of the strut rod (accessed from beneath the cowl) that holds the whole assembly to the car’s frame is seized. (even after an overnight bath in lubricant) My replacement has a 21 mm bolt screwing onto the strut rod, which ends with a 7 mm allen key hole to hold the strut rod in place while that bolt is tightened. But the one on the car is a 21 mm bolt, with the strut rod ending in just a 7-8 mm wide rectangle that I can’t seem to get a purchase on with any wrench. The internet seems to think this is only used on GM cars, and all VW beetle strut replacement videos show the allen key version. Did some mechanic put GM struts on my VW beetle before I inherited it?? ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 18, 2020, 1:17am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/2 "2020-04-18T01:17:04Z")
> [@Will\_Parker](#): > > Do these come in multiple sizes?? yup . . . you got it ---
**Author:** ![Will-Parker](https://avatars.discourse-cdn.com/v4/letter/w/b5a626/32.png) [@Will-Parker](https://community.cartalk.com/u/Will-Parker)\ **Post date:** [April 18, 2020, 1:22am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/3 "2020-04-18T01:22:20Z")
Where? Couldn’t find anything online that actually listed specs. And I’m pretty sure I single-handedly taught the guy on the phone at AutoZone how to change out struts before he finally understood me and said they didn’t stock a part like that. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 18, 2020, 1:37am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/4 "2020-04-18T01:37:31Z")
I meant that mechanics often buy these tools in sets, which would come with the most popular sizes But my previous comment still stands . . . those flats, if you want to call them that, come in several different sizes ---
**Author:** ![Will-Parker](https://avatars.discourse-cdn.com/v4/letter/w/b5a626/32.png) [@Will-Parker](https://community.cartalk.com/u/Will-Parker)\ **Post date:** [April 18, 2020, 1:50am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/5 "2020-04-18T01:50:42Z")
And where could I get a set? ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [April 18, 2020, 1:55am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/6 "2020-04-18T01:55:44Z")
> **[ToolTopia.com](https://www.tooltopia.com/)** > > Find competitive prices on auto repair tools equipment from OTC Tools, Sunex Tools, Robinair and other top brands. Take advantage of daily deals at free shipping at Tooltopia.com. ---
**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\ **Post date:** [April 18, 2020, 3:39am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/7 "2020-04-18T03:39:34Z")
Is there room to get a pipe wrench on it? If all else fails, cut it off with an angle grinder. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 18, 2020, 4:37am UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/8 "2020-04-18T04:37:57Z")
This “tool dilemma” is one of the reasons why I recommend buying fully assembled strut assemblies, complete with strut, coil spring and mount . . . you don’t need special tools to replace the whole assembly Sure, it costs more, but there’s less labor involved, and you know all the parts are new and good to go In too many instances if you just replace the strut, the coil spring might brake later on, or maybe the mounts will break and/or wear out If you do the whole thing, at least you can sleep well, knowing it’ll be good for several more years ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [April 18, 2020, 1:59pm UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/9 "2020-04-18T13:59:27Z")
If the strut assembly is out… and why wouldn’t it be? Cut it off with a friction wheel. You don’t need it anymore, you have a replacement. Just don’t do it until the spring compressors are installed and the spring is loose. I use an impact wrench set on high and blast the nut off. That tenon is not made to remove the strut, it is there to hold the rod while the nut is torqued at assembly. That little bugger will break right off when you try to use it to remove the nut and then you’ll have wasted money on the tool and still use a cut-off wheel or impact to remove it. And it isn’t just GM that uses the double-D tenon. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [April 18, 2020, 2:00pm UTC](https://community.cartalk.com/t/strange-end-double-d-gm-on-a-strut-rod/163015/10 "2020-04-18T14:00:46Z")
You only going to reuse the spring? Get a complete strut assy