This reply may not be best-suited in this table mounted section, but the same topic is being addressed, so...
I never liked the base plate on my hand-held Ryobi R180 due to part of the round perimeter being flat and using it against curved guides/edges, etc. So I bought a universal round, clear, predrilled base which came with additioanl screws, a brass collar w/nut to hold the centering pin, and a brass (centering) pin shaped like a golf tee to theoretically "center" the plate around the router collet.
I cannot get the plate centered after numerous attempts! The predrilled holes are adequatedly sized, so there is ample room for the screws and heads to adjust to the router foot print. I installed the centering collar and it fits snuggly into the plate hole with no slop. I then snuggly pressed the pin into the collar while it "wedges" itself into the collar, presumably to center the plate, and while maintaining pressure, I tighten the router collet, then tighten the four screws, yet the plate is not centered! It is consistantly 1/32"+ off!
This was a couple of months ago. I have used it since then, but now "rotate" the router so as to keep the same area of the plate against the guide edges when I'm not using a bearing bit. What can it be? Is the plate center-hole NOT centered? :blink: