X5 spur gear and more

[cmgreen]

Guys,

Only had my x5 a couple of weeks and gone through 2 spur gears, my own fault, not meshing properly, but at £11 quid each its getting to be expensive. Can you buy different ones?

Also, is the slipper ment to slip, cause i have heard to keep it tight so it doesnt damage the pucks on the slipper.