Hi well there is a little more to the story. I bought the 145 and 1245 heads together from a retired sewing machine mechanic for $200. They came out of a little shed full of old industrial sewing machines and clutch motors strewn about on the floor. He gave me a plastic bag of parts to put the 145 back together and told me that the 1245 just needed a hook. The hook looked pretty new to me and I didn't see anything wrong with it. I thought that I had scored big time. both machines were seized. When I got them home and started cleaning and assessing, I realized that he had swapped parts (including hook saddles) between the machines trying to get the 1245 running. To make matters worse, most of the parts in the bag were either not for either machine, or close enough to cause a question mark. Long story short, by now my head was swimming from trying to unravel the mess and navigate Phaff's parts diagrams and numbering system and most of my parts don't have part numbers on them. So while in that mode, I noticed the paint shade difference between the 1245 hook saddle and the machine casting itself. Who knows what it came off of? May be right, maybe not? I called him up looking for the missing gear but he doesn't know. Gear cases are missing from both machines too. I have the 1245 gear case coming from Germany now, but as I said, I can't get a handle on the gear set. I tried Strima Poland, sewtech71, (Ebay used parts dealer) Cutsew, Pennsew (which is where I get my parts). Thanks for looking into that for me Constabulary, you got further than I did. College Sewing does show it but it's on back order. I will try Keysew. but It's starting to look like the only way I'm going to find it new is on a dusty old shelf somewhere in a hometown sewing repair shop. That's where the retrofit comes in, anyone know if it will work?