Well today I measured the 2 areas that were visibly different between the original part and the one that Ken made for me. Ken's part was as per the print that Kondia sent me (dated 1973). My mill has been estimated to be from 1969 or 1970, although this hasn't been confirmed.
Today Kondia sent me the print for the quill stop micrometer screw, so I could locate the missing hole and drill it. My only concern now is whether or not this part changed, as the print is dated 1976. I'm hopeful that I'll be OK. Although I now need to buy a 6.5mm reamer, as I'm sure the hole has to be fairly accurate. However, all that appears next to the dimension is "al montaje", which Google tells me is Spanish for "assembly". It is hand written, so I could be reading it wrong but no other combination of possible letters produced anything legible.
Today Kondia sent me the print for the quill stop micrometer screw, so I could locate the missing hole and drill it. My only concern now is whether or not this part changed, as the print is dated 1976. I'm hopeful that I'll be OK. Although I now need to buy a 6.5mm reamer, as I'm sure the hole has to be fairly accurate. However, all that appears next to the dimension is "al montaje", which Google tells me is Spanish for "assembly". It is hand written, so I could be reading it wrong but no other combination of possible letters produced anything legible.
Hunting American dentists since 2015.