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.

I'd like the flexibility to use more shank sizes, so I was considering an extension that gives me the ability to use ER20 collets: Axcaliber Router Collet Extension (1/2" Shank) - Router Collets - Routing - Power Tool Accessories - Accessories | Axminster Tools & Machinery

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?

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