New clock depthing tool

Picture says most of it.. I designed a new depthing tool in OpenSCAD that should be a bit more stable than the previous one.  It's also intended that the arbors are fixed and the wheels spin around them.  The design consists of two parallel bars that hold three I-shaped blocks.  The outer two I-shaped blocks are attached to the bars, while the middle one can slide.  The left two blocks have arbors through them.  The sliding block is locked by tightening a knurled nut holding everything together.