[Chrislong]

Sounds like the spur is Fubar'd, they can wear. If there is slop in that centre hole on the layshaft id certainly recommend retiring the spur.

With the XX4 pulley (it is 1 tooth bigger than the X-factory pulleys), you will need a shim as the gear is narrower than the stock pulley - and you don't want your layshaft floating around.