Pfaff 346-H2 won't pick up bobbin thread

[GPD]

A new to me Pfaff double needle 346-H2.  Won't pick up the bobbin thread.  Ya, I've tried moving the rotary hook closer to the needle scarf.  Used the needle bar clamp and gauge.  (1.8mm).  finally called in a repair guy from the local sewing machine shop that serviced industrial machines.  No joy, couldn't "fix" it.  There has got to be something I'm missing here.  The repairer say the hooks are probably worn out?  No, it has never sewn for me.  Just now starting to get it recommissioned after picking it up a couple years ago. .  

SOOOO...  what am I missing?

OR, anyone know of a replacement part for these rotary hooks?  I can't find any info on interchangeable parts/modern made.  Are any Pfaff single needle machine parts interchangeable?