I am looking for 4 air injector tubes. I can't seem to find the right size bolt to plug the holes. So I guess I will put tubes back on and cap them.

Thanks,
Steve

Match the thread pitch at your local hardware store. It's simple. There are only so many. Plug that pig.

It is a 10 mm by 1.0 pitch. Fairly uncommon pitch, and very hard to find 50 mm long. I am still looking. But, no luck yet.

It is a common 10mm fine thread. My experience is that bolts tend to back out. The tubes are attached to the antlers that prevent that. I would put in a bolt with some blue or red Loctite to keep them in.