Old bike - Chainring bolts I have an old "Favorit" racing bike from Czechoslovakia and I'm missing some bolts on the chainring. I went trough some bike shops and couldn't find a replacing one. The bolts diameter is slightly smaller on mine which make the new unable to fit. 




I would like to keep the "style" of my bike as intact as possible. I can see two options here:


Find a website with such old chainring bolts (if anyone got any tips here, I've been pretty unlucky so far)
Make the hole in the chainring slightly bigger (by using a file?).


What would you recommend? Would option 2) be even possible?

Thanks in advance!
I recommend against filing out the bolt holes. You will not be able to get to holes round enough with a file and the bolt surfaces will not engage with the crank properly. You could try drilling the holes slightly bigger but I'd still be worried about getting the hole diameter accurate enough.