window motor

hi bev and everyone else on the board, had door in bits i have found the motor itself works fine both ways but the plasic bit which the metal cog pops onto to has sheered off, can you buy a repair kit for them? cheapest i have seen a motor is £120. anyway car is away to get the 1.7 8v volvo turbo engine in next week so i will keep use posted to let use know how it goes.