I've got an old K2 KG3925 CNC machine, fitted with a Porter Cable 829 router, and 1/2" and 1/4" collets. I mostly machine wood, MDF, and the occasional bit of plastic.
Given the likely runout of the 892, and the fact I don't need tolerances to the thousandths, is the above extension likely to be acceptable, or are they going to be really bad with smaller bits?