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Looks like yours failed in the same place as mine. You can extend the threaded rod farther into the broken boss. If you go too far you may have to shorten the shifter mount screw.

The (rigid rear) DV/KV style first appeared with the 1992 DeltaV 900. There's a picture of mine in the gallery, though mine has SunTour instead of the original Shimano LX. Early Delta Vs could be either fully suspended or Headshok only. After the introduction of the Super V, the Delta V...

I'll assume that you want to continue to use down tube shifters. Have you taken your shifter boss assembly apart? I'd like to see where it failed.

I don't know anything about the fork. Guessing the damper needs some work but I can't help. I'd be interested to know what it weighs. I have a pretty contemporary Cannondale Headshok bike. I've never weighed it but it would be interesting to compare. I'd be surprised if there were more than...

It appears to be a Terry Grimes frame with an Action-Tec fork. Some info on the frame builder here: https://www.bikeforums.net/framebuilders/728020-terry-grimes-designs.htmlhttps://www.bikeforums.net/framebuilders/728020-terry-grimes-designs.html What's wrong with the fork? I believe...

If you are using STI or Ergopower shifters, I can make something to mount the cable adjusters without the stock bosses.

Mine has an issue. The die-cast boss came apart when someone removed it. Click on the thumbnail for disassembled view. There is still enough thread inside to hold, but I would probably remove the broken bit from the threaded stud and epoxy the stud into the die-cast boss. The threads on the...

I have a used one. It's something I can probably duplicate.

What years/models were 1 1/4"? Pretty sure my 1993 M800 is, but my 1991 Beast is 1".

The shape of the boot is what made me think that it's not a Headshok. I can't imagine stretching a round boot that much and not having it look all crumpled up. That boot looks like it was made wider side to side than it is front to back.

I don't know what it is but am pretty sure it's not a Cannondale. I sent a message to a frame builder who might know. Will let you know if he has an idea who built it.

Welcome. That's a really nice looking Jekyll.

I don't have a Jekyll but I'd think you could measure the swing arm and find an off the shelf bolt and nut. I'd use a thin head cap screw and a locking (nylon insert) flange nut with thin stainless steel washers under each.

I've never seen a Cannondale with unfinished welds. Not sure about the fork, wondering about the Fox decal on the head tube. Surely worth what they're asking though if working condition is good.

There seem to be quite a few tandems out there but I've never checked the serial numbers of any I've seen. Friend has an older one. I'll have to see if I can read it. At any rate, I'd surely think that 1989 would be the rarest year.

23"/21" frame, the 15th built in May, 1989. I would have thought that there would be a 5 or a 0 ahead of that number to indicate dropout spacing.

I was guessing based on what Brian had said. I would measure the ID and see if it's 34 mm. If so you should be able to install standard external cups directly in them. The SV500 I mentioned looks like it has an adapter cup on the bottom that spaces the bottom of the head tube up from the fork...

Nicely done. Thanks.

Have you checked your serial number? It would be pretty cool to have a first year tandem.

Would a Headshok frame have had a different head tube than a Moto frame? There was a SV500 in 1997 that came with a Rockshox Quadra 5 fork. I'd think those adapter cups could be original.