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Given that the 52 has been out of production for some time I've always been concerned about a part breaking on my gun & not being able to find a replacement.
Try Wortner Gun Works Ltd, 433 Queen St Chatham, On. N7M 5K5. 613-746-4094. I have bought parts for a Model 41 from them. If he doesn't have what you need, he may be able to order for you. My dealings with them have always been A+. Last email address I have for him is wortner@bellnet.ca. Don't know if that is current though.
I login at Numrich and had no hassles getting parts I need since. Much easier than not having a client status with them. Price, shipping, exchange rate and availability is another matter.
Disassembly and reassembly instructions.
Note that drawing is for first model M52, slightly different to M52-1 and M52-2
Drawbar, Part #54 is stamped on 52-2 as in pictures in above and part #55 is not used in later models.