Jigsaw - switch needs repairing (Broadwindsor DT83)

This black and decker mains powered jigsaw works when turned on.
 The problem is with the switch and although it works it is currently unsafe because it doesn’t turn on and off when the switch is released.
If the mains power is on then the blade is running, so the switch HAS to be repaired, please don’t attempt to use as is.

Other than the switch it is working well.

Fair Chance Policy: I’ll wait before choosing a recipient to give more people a chance to reply.