May I inquire as to why you needed those measurements? Just curious as I had tying issues that resulted in tearing down the entire knotter stack on my 520 baler. I have the book plus some knotter guides that I used to set mine up.

I think my problem was caused by the cam gear lobes being worn down and allowing the billhook to do it's own thing. I had already replaced the billhook and knife, timed the discs, checked needle clearance, and adjusted tension on the bill hook both up/down. Once I had done all that I finally noticed the very shiny spots on the cam gear and compared the gear with the other. So I replaced it.

I was able to find enough material to run a dozen bales last fall, looks promising, but untill I get it out in the field I won't know. If it doesn't work I only have one other item and that is the twine finger. The very tip of the twine finger is broken off (no longer comes to a point). I did adjust the finger per the manual so what is there rests at the edge of the cutout like is shown in the manual. I would replace it, but I haven't found one. It seems the later designs (Hesston) of my baler did away with these so there is no stock unless on some dusty forgotten shelf or used.

Hope to cut some this weekend. We've had so much rain in central Indy this past month I have'nt had a good window.