Pitan - Gear 2 to use allen bolt

When I assemble my Pitan, noted the turn is not easy on entire lap.

I investigated this and looks like in some countries is too difficult to get bolts that are correct centered.

For example in my country, the hexagonal bolts are not symmetrical because are not designed for this proposal. A side had 1.7mm and the other side 2.0mm

0.3mm is much difference to perform a good machining.

So I decied make a modification to allow a allen bolt. Ussualy this bolts are build with more simetrica