[KensRedZed]

Thanks John,

The guy that casts these urethanes just copies steel washers. These are for a 2-56 size thread. I use 4-40 screws. So I needed to add a 2.5mm washer to prevent the urethane from slipping past the screw and through the hole in the chassis. I can't convince him to cast 4-40 size urethanes for some reason. So I adapt.

I'll try and measure the rubbery little things for you after my first coffee. Umm... maybe my second.