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wrote:
My first action would be to contact the mfgr and see what replacement
parts are available and costs, etc. Also ask for a schematic. Try
Googling on the model number.

H.R.(Bob) Hofmann

If they sanded off the numbers they most certainly won't supply a schematic.

I'd first suspect cracked solder joints, if those are all ok then look
into the power component, almost certainly a triac which controls power
to the motor. If all else fails you could build a new speed control from
scratch, they need not be very complicated.