Quote Originally Posted by Rick A View Post
I've had several 23's (still have one)and no problems with any lens I use. Make sure the condensors are set for 35mm, and they are inserted in the head properly. As for the el-Nikkor hitting, somethings not assembled correctly, it shouldn't hit anything. I have a 50/2.8 on my currant 23C and it fits fine.
This.

I really wish I was in PA right now as I have a 23C there and could take pictures and measurements to make sure yours is set up correctly.
I use a Schneider Componon S 50mm and doubt I've ever gotten close to mashing the lensboard to the stage. What size images have you been trying to make? 8x10 and 11x14 should both be easy to do - smaller and larger than those can get trickier.