Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
Well - maybe you try using a lap that has three segments instead of two. I did use such a design for the few times I did lap rods and it seemed to work quite well although I never checked if the lapped rods were round.
I would think the radial slits must help.
yes you have the three lobed roundit looks like the rotor of a Wankel engine its not round but measures as if it is there is a name for it