After cleaning, examining, and hemming and hawing, I decided the plug was probably correct and gently ran a M14 1.25 tap. The tap met some gentle resistance but followed the threads. Afterwards the plug fit perfectly. Thanks all for the help!
After cleaning, examining, and hemming and hawing, I decided the plug was probably correct and gently ran a M14 1.25 tap. The tap met some gentle resistance but followed the threads. Afterwards the plug fit perfectly. Thanks all for the help!