Alan Adamson Posted June 16, 2009 Share Posted June 16, 2009 (edited) So, on my 550, the damn cotter pin, is always a mess and causes the primer catch flap to stick either up or down, both have problems... One causes primers to go everywhere, and other gets in the way of the primer bar - bad news... I figured out that the drilled hole size in the flap and ramp is .059" and so I went to my favorite hardware store - McMaster Carr and found some pins that would be slightly undersized. I actually tried 2 different things, both work. One has a head on it, so you just cut it to length and then I'll tell you what to do on the other (non-head side)... The other is just a roll pin with no head on either side... Again, you just cut it to length, accounting for whatever you will use to retain it and walla - fixed. Below are the Mcmaster Carr part numbers. PartNumber, QTY, Description 98378A304, 1, .001" Precision Perforator Pin, .050" Pin Dia, 3/32" Head Dia, 2-1/2" O’all Length 1263K93, 1, Miniature 316 Stainless Steel Drive Shaft, 3/64" Od, 3" Length Now how to retain the ends that don't have a head. I had some silicone tubing around and small hole punch, so I punched a couple of round disks, took a very small drill in my fingers and poked a hole thru the middle of the silicone disks and pushed them on the ends, leaving just a smidge of play so the pin will float. You could use anything really... just something simple to retain the ends... If you really wanted to, you can buy some small tubing from McMaster as well, and cut little bushings that you'd slide on the end... Just make sure you get the ID smaller than the pin OD such that it's a press to fit. Works great and no more issues with the flapper door... YMMV, Alan Edited June 16, 2009 by Alan Adamson Link to comment Share on other sites More sharing options...
kaiserb Posted June 16, 2009 Share Posted June 16, 2009 So, on my 550, the damn cotter pin, is always a mess and causes the primer catch flap to stick either up or down, both have problems... One causes primers to go everywhere, and other gets in the way of the primer bar - bad news...I figured out that the drilled hole size in the flap and ramp is .059" and so I went to my favorite hardware store - McMaster Carr and found some pins that would be slightly undersized. I had the same issue... I used a cheaper source for the pin-- the paper clip box. A section of paperclip works well in the existing hole, and has not jammed yet. Link to comment Share on other sites More sharing options...
vluc Posted June 16, 2009 Share Posted June 16, 2009 large safety pin also works. Link to comment Share on other sites More sharing options...
Intel6 Posted June 16, 2009 Share Posted June 16, 2009 I used a wire nail, already had a flat head on one side and just bent down the other Neal in AZ Link to comment Share on other sites More sharing options...
SavageMOA Posted June 19, 2009 Share Posted June 19, 2009 You guys are a Godsend. My 550 just started doing this. I'm gonna try these remedies. Thanks fellas! Link to comment Share on other sites More sharing options...
ChuckS Posted June 19, 2009 Share Posted June 19, 2009 I also used a paper clip on my 550. Solved the binding permanently. Link to comment Share on other sites More sharing options...
dillon Posted June 19, 2009 Share Posted June 19, 2009 If you use a small safety pin, just open it, push the pointy end through all the holes, and snap it closed, you now have a hardened stell axle for the spent primer catcher to pivot on. Link to comment Share on other sites More sharing options...
larry cazes Posted June 22, 2009 Share Posted June 22, 2009 If you use a small safety pin, just open it, push the pointy end through all the holes, and snap it closed, you now have a hardened stell axle for the spent primer catcher to pivot on. Any idea why Dillon has not fixed this issue? Link to comment Share on other sites More sharing options...
dillon Posted June 23, 2009 Share Posted June 23, 2009 It typically takes over 100K rounds to sufficiently deform the current cotter key. We are happy to mail out a replacement, but most users are more interested in fixing an issue quickly, and virtually everyone has a safety pin accessable. You can also straighten out the existing pin and reuse it. Link to comment Share on other sites More sharing options...
kildar Posted July 5, 2009 Share Posted July 5, 2009 (edited) I replaced the cotter pin on my 550 with a section of paper clip last night. Hoorah! no more primers all over the floor. Wished I would have done this years ago. Thanks for the tip. Edited July 5, 2009 by kildar Link to comment Share on other sites More sharing options...
NoSteel Posted July 5, 2009 Share Posted July 5, 2009 +1 on the paper clip section.. The first of many ideas I pulled of this forum since joining... Just can't beat doing it right the first time thanks to the efforts of others!!!! Link to comment Share on other sites More sharing options...
buddy_fuentes Posted July 5, 2009 Share Posted July 5, 2009 Straight pin...shove it through the holes bend the end and you're done. Link to comment Share on other sites More sharing options...
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