Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "alan00463" <alan00463@y...> 
wrote:
>
> Another factor about the die grinders:    Do they use a 3 piece collet
> or a 4 piece collet?    Stefan said the 3 piece collets are superior.
>   I see that is true in theory.  I am inexperienced in practice.
>

I have an old shunt/series dc motor that I think runs in the 20K to 30K 
speed range with just a smooth shaft coming out of the berring.

How does one fit a collet to one of these?