Hamada 770 Number unit

Recently picked up a Hamada 770 CD +NP from a closed shop. Hope to transfer the printing of forms with numbering to save work and time in one pass.
The ink ductor latch need repair/ replace due to the negligent of the previous operator. He didn't lock the numbering unit properly so bearing and wheels & latch got worn out and deformed. I don't have the parts book or operator manual to look up any reference number to obtain a replacement part. Can anyone help? ( have a copy of the Hamada 700/770CD part catelogue but doesn't have any saying about the NP unit )
Keep working on this machine to clean up and trying to bring it up to standard ( it'd been sit ideal for long period of time and also lack of care when they were running the machine )

 

AL Larsen in Mass has some parts, catalogs etc.....keep in mind the 700 series has been out of production for some time. While most common parts can be had some can be quite hard to find. They are one of the original Hamada dealers from back in the day. Good people. http://www.allarsen.com/contact

 

Was on ebay and saw some of these. might be a inexpensive solution for you? http://www.ebay.com/itm/Convex-Numb...hash=item3f5ff67578:m:mRULCDnXRH1xZjQpRfzPIfw

They sell a few types.