Does anyone manufacture an alternative Linn Sondek belt pulley ?

I am so tired of adjusting that terrible pulley that my Linn Sondek has at present.  I cannot stop the belt from slipping, regardless of how many belts I have changed and however many adjustments I have made.  Maybe on my TT, the axis of the motor mount wrt the chassis is bent..... Regardless, I do not want to spend any more money on TTs except maybe just for a new fool proof pulley.  Besides, its sound to me, is still great, when the belt does not slip.

If anyone manufactures a Linn GROOVED pulley for a standard 2 or 3 mm diameter ROUND belt, it would be perfect.  It would be so much more capable of dealing with slight imperfections and age and mechanics of older TTs, which I am prepared to live with.

Anyone know any third parties doing this ?

Thanks