Removing Stripped Simplex Derailleur
12-12-20, 11:05 AM
#1
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Removing Stripped Simplex Derailleur
So I picked up a vintage Mercier with a Simplex group on it. Was considering parting it out. However, the rear derailleur, which bolts from the inside of the dropout, is stripped. It was like that when I got it....and that's my story and I'm stickin' to it. I believe this was/is a 6mm hex fitting. So, do i have any other choices other than drilling it and using an easy out tool for removal? Can I find a replacement bolt for this? Thank you.
12-12-20, 11:19 AM
#2
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I'd drill it using a drill that is the size or tad more than the hex someone other than you must have used when it stripped. <grin>
You might find a torx bit that it a little bigger and tap it into the head and try that, but you'd risk marring up the DR with whatever you backed it up with on the other side to pound on.
Do you think the red on the bolt ends is thread locker that someone put on it? Heat might be needed and that's an issue for discoloration of the finish if a lot is required.
You might find a torx bit that it a little bigger and tap it into the head and try that, but you'd risk marring up the DR with whatever you backed it up with on the other side to pound on.
Do you think the red on the bolt ends is thread locker that someone put on it? Heat might be needed and that's an issue for discoloration of the finish if a lot is required.
12-12-20, 11:38 AM
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If you had access to a MIG welder or a friend with one, weld a slightly smaller nut to the stripped nut and
use a wrench to get it off. Replacement "T" nuts are available for this type mount.
Google "welding nut' on youtube for videos explaining this approach.
use a wrench to get it off. Replacement "T" nuts are available for this type mount.
Google "welding nut' on youtube for videos explaining this approach.
Last edited by sch; 12-12-20 at 11:41 AM.
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12-12-20, 11:48 AM
#4
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I'd drill it using a drill that is the size or tad more than the hex someone other than you must have used when it stripped. <grin>
You might find a torx bit that it a little bigger and tap it into the head and try that, but you'd risk marring up the DR with whatever you backed it up with on the other side to pound on.
Do you think the red on the bolt ends is thread locker that someone put on it? Heat might be needed and that's an issue for discoloration of the finish if a lot is required.
You might find a torx bit that it a little bigger and tap it into the head and try that, but you'd risk marring up the DR with whatever you backed it up with on the other side to pound on.
Do you think the red on the bolt ends is thread locker that someone put on it? Heat might be needed and that's an issue for discoloration of the finish if a lot is required.
12-12-20, 11:53 AM
#5
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Pound a suitable torx bit in it.
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12-12-20, 12:25 PM
#6
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It’s weird for the mounting bolt to be screwed from inside the stays/dropouts. If you remove that small red cap on the outside does it possible expose another hex head???
Dan
Dan
12-12-20, 12:30 PM
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12-12-20, 12:32 PM
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12-12-20, 02:18 PM
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12-12-20, 05:39 PM
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That's the first thing I'd try. Drilling it out will be awkward because the other side of the rear triangle will make it hard to get the drill in there and aligned properly. If you can do it (right-angle drill?), a left hand twist drill bit would help unscrew the bolt.
12-12-20, 05:42 PM
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That's the way Simplex does it. Say no more. The red cap on the other side is to discourage you from trying to remove the derailleur that way. That is the adjustment for the spring tension, and cranking on it more than a fraction of a turn will break the spring.
12-13-20, 08:25 AM
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Older Simplex derailleurs don't mount on a threaded dropout. The Simplex DO is unthreaded and the bolt at issue is a shoulder bolt the sits in the unthreaded dropout mount installed from the rear threading into the RD itself. Either way, if he's parting it out, getting out the bolt was the only issue other than sourcing a replacement bolt to sell the RD.
https://www.bikeforums.net/classic-v...s-peugeot.html
https://www.bikeforums.net/classic-v...s-peugeot.html
