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BTW - did you ever find a PDF owner manual for these - yours looks very similar to mine and paperwork would be great...

This is what I was hoping to do... leave the framework and wiring and motors intact... just upgrading the controller (perhaps the spindle) and stepper drivers... Seems like digging in too deeply...

So... I know this post is old... But I just purchased a used Router Master 52 - and I will most likely want to update the controller - looking at either the DDSCV3.1 (I have a few of these) or a...

Acelcobra.... Did you ever solve the issue? I have the exact same problem and could use some guidance...