[How do i slow my jigsaw down?]

Hi,

I have a non-variable black & decker jigsaw, how can i slow it down?

i'm cutting pvc which melts because of blade speed.

There must be a way, of decreasing the current, given to the motor.

I can open it up, what do i need to do? Maybe use an external dc or something. Please there must be a simple way of slowing it down.

Thanks

John