Vertex Spares

Who supplies vertex spares?

I'm looking for a worm gear for a HV-6 rotary table (using it to machine the edge of a 12" round 1/2" steel plate was maybe pushing it a bit beyond it's limits...), and chronos were not exactly helpful. They said they could probably get one in 6-8weeks, provided I knew the part number.

I could really do with one before then.

thanks Moray