The valve core is always removed when dismounting/mounting a tire. The replacement valve core may have a lower pintle height than the old valve core and doesn’t function well with your bicycle tire pump.
This is not an issue that I would take to the president of Discount tire.
wife came home. the compressor works on all 4 tires. the distance from the nozzle end to the pin inside seems a little shorter than the bike pump (meaning less nipple is needed to attach and inflate the tire). Thanks again. wish I bought this or called Discount before clogging up this board and wasting your time. but I appreciate your expertise and help. You’ll laugh but I’m thinking of going back and getting one for my trunk so both cars have a compressor pump. What’s 100 bucks. Again, thanks. I wish I knew they replaced or removed the stem. If so, I would never have posted here as I would have figured it out on my own. Maybe someone will benefit from these answers in the future.
that makes sense. longer nut by a mm or two. And the pump needs more distance from the nozzle opening to the pin inside to push the valve core. If I knew they did that, I would not have posted and figured it out on my own. That was the confusion. How did it change without them changing or moving the stem or nut??? Oh well, such is life. Sometimes spending money helps.
I’m older and honestly, I’m athletic/weight lifter for 30 years so pumping a bike pump worked and I got a little exercise. Then the change in the stem length and my confusion. but I’ll give you that on your statement. That compressor (49 bucks with tax from harbor freight), is really nice.
What’s the deal? I add a pound in 10 seconds with my hand pump. And it doesn’t drain the battery. I’ve had flats in remote cold areas where I feared running down the battery. I’m older than @oilman. I keep a foot pump in the pickup so I can keep my hands warm but use the hand pump at home. I benefit from the exercise. I found this article bracing: https://jamanetwork.com/journals/jama/fullarticle/2825092
Out of curiosity, why won’t you condider that Airmoto portable inflator?
Welcome to the 19th century.
I must be about your age, and I cannot imagine manually inflating car tires.
I wouldn’t have considered it even decades ago. Sounds really miserable.
While I’ve always owned battery powered portable air pumps, I’ve filled many tires over the years with a manual bike-style air pump.
Unless I’ve been in a big hurry, it’s always worked fine.
Plus, I view the exercise as something I could use.
Do those clip on the valve stem . . . or screw on?
All the manual pumps over the years that I’ve used all clip on.
Don’t worry about taking up space here. There has been very little traffic here for a while.
I’ve found that to occasionally be a problem, as far as inflating car tires goes
It’s been my experience that when you’re pumping away, the chuck will blow off of the valve stem
It’s another reason why I got my girlfriend that airmoto . . . it screws onto the valve stem and then you just set up whatever tire pressure you want and let the device do its thing
I’m not arguing with you about the exercise aspect, btw 
There’s no such thing as a bad question. Folks w/similar problems using the forum search feature will definitely benefit from your postings.
It’s not at all miserable. I imagine it’s just as fast, except if the tire is flat. If it is, then the time it takes to swap tires swamps the extra minutes to inflate the tire. The exercise is good for me. I go to the gym every other day - why not inflate my own tires?
I pump my bicycle’s tires up weekly, to 100 psi. You’re either not inserting the chuck far enough or you’re being careless while pumping.
I have a 60gal air compressor tank with 100 feet of air hose and still don’t like putting air in tires… 
I’ve got my garage plumbed with air spigots and I agree it’s a pain to check tires. But I recently bought one of those deals with the pressure gauge attached and it has been a game changer. Snap it on, read the pressure and add or remove until the gauge shows what I want. No kneeling at the tires anymore. It’s a few pounds off because I bought a cheap one, but a game changer for me.
I am thinking of getting one of the cordless air compressors for tires, just can’t make up my mind, I have a lot of craftsman battery’s for extended use, but I don’t like the craftsman one… ugg
But I don’t kneel anyway, i use an old office chair and roll around the car… lol
Full replacement knee, them days are long gone…
But I also have multiple portable air tanks if needed away from the shop…
Is that what you meant to say?
It’s a major convenience to stick with one battery type, I use the Ryobi 18v, for yard tools and an inflator. I see three Craftsman inflators on Amazon that use their 20V battery, all pretty well rated.
How often are you (and everyone else here) adding air to you tires? I have 4 cars in the home fleet and I might have to add air twice a year. I mean, cleaning the toilet is more of a pain than airing up a tire and that happens much more often than twice a year. 
But seriously, how often do you find a tire low that needs to be aired up?