G103 tow hook pulley replacement

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Grob 103 Twin II. There are two pulleys that route the tow
release cable to the nose tow hook. We discovered that
the forward pulley, which is hidden inside of a duct for the
vent, has a sector (about 45 degrees) missing on the plastic
sheave. We believe that the sector broke out long ago
and we have been flying with a defective part.

Does anyone have experience with this pulley? Any suggestions
on replacement part suppliers besides Grob in Germany?
I have also heard that some people have replaced the plastic
sheave with an aluminum version.

Any information would be appreciated.

Thanks,
Charlie Martin
Soaring Society of Boulder