You might want to talk to the folks you bought your flexshaft from,
because you should be able to run it dead slow with no trouble at
Noel is right, you should have great control with the right foot
pedal. I was having problems with the one my fordom came with, I
thought it was just me, but then I asked around and discovered many
jewelers using the Lucas foot control, so I got one and love it.
otto frei part number: 134.323