Cougar gears

[racingdwarf]

bought a second hand cougar last month, as soon as I got it I replaced the transmision housing with the new one with the extra screw, and fitted the RW gear set, as these had had good reports, since then it has done three small club meetings and petit
Last night at club just at the end of the final I could hear the dredded sound of gears jumping and stripping. Got home and got in bits, inside was ok, more ware than I would expect to see for just over an hours run time, but the 33T RW idler gear on the outside was just about bald and the metal layshaft one that drives it was not looking to good eather...so not to chuffed,
What concerns me tho is the amount of movment, I can get the gears to move back and forth about half a millimeter, bit of a hit and miss mesh!

Bearings are good, shafts are all ok, Anyone else had this? is this one of the things the alloy housing gets rid of (hope not) or will steal gears be the answear