Bumper- Thanks for the tips. I think the reinforcing pin is a good idea on the pins with a small eccentric. The witness mark on the face is also something I will consider incorporating.

Now that I am going into production, can RAS readers help me by sending me the diameter of their main spar pins? I'd like to set up a glider database so I can anticipate the demand.

Thanks. I can be emailed at: info (at) mmfabrication (dot) com