Stripped threads where gas cylinder attaches - George Foreman GP100 Grill

Over torqued and you run the risk of a stripped thread or broken head bolt. Under torqued and the compression gas will leak past the head gasket and burn it out.

Is your bolt stripped or is the actual threaded part in the handle stripped. The bolt can be replaced from Daisy or in a pinch you can use a standard bolt to put pressure on the cylinder. If the threaded part in the handle is stripped that is a little more of an issue. If it is stripped I think you have to options:
1 Find a tap for the threads on the bolt and run it through the existing threads and see if you can get it cleaned out and working.
2 Next option would be to drill it out to the next thread size and re tap it and then use a new bolt to secure the cylinder.
I hope this helps.

If the thread is stripped you wont be able to get a good seal even with a non fouler or a threaded insert. They still need something to get a grip on. The thread size is 14mm. If you try to tap it bigger or use an insert you risk cracking the head. If you need a quick fix to get down the road you can JB weld the spark plug back in. This won't last long since JB weld dissolves in gas but it could get you by for up to a day. JB weld is hard to get off after but once again, soak it in gas to help clean it up. Get a helicoil when you can. Don't let a quick fix lead to long lasting problems.

same thing happened to me, I had to make another one there made of some kind of puter

If you wan to try to repair the head you would be looking for a product called a helicoil.

On my air scout the regulator cap, which is threaded to receive the bolt attached to the regulator knob was stripped. It's cheapo metal. I removed that and the knob (which is held onto the bolt with a smaller reverse-threaded screw, and replaced the cap using a larger diameter bolt I place of the knob. Works.

This can be repaired with a heli coil ( thread insert ) they are normally a short 14mm thread, an good chain saw/engineering shop will do this for you, or you can purchase your own kit and do it, but this will be expensive if you are only doing one

The issue seems to be related to the spark plug threads. The spark plug is either not tightened down or the threads are stripped, and during the compression stroke when pressure is applied inside the combustion chamber, the pressure leaks thru the spark plug threads and blows off the spark plug boot. If the spark plug is not tightened and the threads are ok, then tightening the plug will resolve this issue. If the spark plug threads are damaged, then the threads will need to be repaired, and will require the cylinder head to be removed to repair the stripped threads. Taking the cylinder head off requires the engine's top end to be ripped apart and re-assembled....big job.

no they sale kits to repair that try calling around to your local auto parts stores and find one

Hardware stores should have thumb screws in different sizes and thread lengths ... box stores , local hardware ....