I have an RL 550 that is probably close to 25 years old, this is the model previous to the 550B.
I've taken it completely down several times to clean and lube, but have never been able to get the left (as looking at in the manual) nut off the link arm pin (PN 13700). This is the older link arm pin that does not have a grease zerk.
Up to this point I've use a pin on my grease gun to get a little grease to the lower link arm area, but now I need to get it off. The problem is the nut turns, but doesn't come off. In looking at the link pin, the threaded portion on the left end, as seen through the nut, looks to be a different color - brass or copper - compared to the stainless threaded portion on the other end.
I have no reason to believe the bolt is stripped, unless it came from Dillon that way.
Does anyone have a clue? Dillon doesn't open till Monday and I'd like to get this pin replaced and get back to loading.