filling holes in an unstayed carbon mast

[marlinspike]

Would you really get thermal runway on a part you made for a small plug?

Well, probably yes if I followed the initial instructions I had, which were to lay up an entire sheet at the mast thickness, and then cut a plug out of it afterwards. I don't know how to make just a small plug directly, unless I were to try something like what was in that video.

But several people have said the CF rods are fine, so I should probably just do that?

 

[Fellies]

Just buy rods or a sheet then. Your plugs are so small anyway, as you said you could use them for plates or whatever be for other parts would be the easiest as the other guy said. Lots of reputable builders especially up north of the USA that you could ask to build you a small sheet in the USA

FYI and if it were me ( I dont live in the USA ), and you wanted to lay up a whole sheet in your garage without pre preg then you could layup 5 layers at a time with a vac bag, drop the temperature, pull the peel ply off while its slightly cured keeping a bstage, repeat the process so you getting a better crosslink with more layers with the same bag until your thickness you need and ramp up your heat on the final layup for the postcure to not get thermal runaway if you really wanted to get similar results to an autoclave with prepreg. Dont use any fillers and the same resin system to not get expansion.

Teds advice is anyways fine whether you build a sheet, buy a sheet or whatever, I would just use a proper glue like spabond to more or less match the carbon, push in as far as i could with a sacrifical little stopper at the back to try get some glue on the inside to help.

That is just what I would do, then again, Teds advice is the one you should be listening to here.
Good luck