I have a variable speed dremel that fried the speed cotnrol and I by
passed the control after not being able to get replacement board, Then
I took a push button , on off light dimmer wall switch
and mounted it in shallow wall box . With a large round rubber heel
from old shoe made a foot operated swich that allows for speed control
also. Works good.

Cuezilla wrote:

I was at the bird shop to get my birds nails trimmed. The lady had a
Dremal tool plugged into a sewing machine restate (sp?). It let he
control the speed without having to adjust the speed control switch on
the tool. Would this in any way be damaging to the tool? I have a
single speed tool that I was thinking of doing this with. Seemed like
a good idea.