I know parts can add considerably to the cost. Either way, you got the machine for a very good price and it's worth spending money and effort on these machines, considering a fixup can last a generation or two. I hate the idea of scavanging machines for parts, or toss out a machine for the cabinet. That's how we often source parts these days, but I hope it's not done all the time.
When I bought my 201K spool pin were missing, needed new motor belt, light needed replacement, on the pluss side it was in fairly good condition and the box of accessories was with the machine. I still need to work on the tiny cabinet it's in. Your machines are older than mine. It's a joy when you get them looking good and running smoothly. I emvy you the nice threadle cabinets a bit :- )