Quote Originally Posted by Dan Fromm
I'm glad to see that two square tubes with spacers work so nicely. That was about the third design I came up with for the base of my tandem rig. I'd have done it, but came across some very inexpensive t-slotted extrusion that required less drilling and cutting.
I thought I'd need to put in some film shim's to make the spacers just a tad thicker than the bits the bolts for the standards went through (as they were cut from the same piece of plastic/nylon/teflon(?) stuff) - but it turns out they run just fine for focusing ...

I'm going to look into rack and friction drives maybe - but it might just be extra work (and weight) for little gain ...

Hmmmm, anyone built an enlarger ? same sort of issues ?