Somehow the nut for the TCU control panel has become loose

[Kave]

When I installed my dropper post I somehow put the screw wrong to the TCU control panel. It sits there fine now, but when I try to unscrew it I can see that the “nut” attached to the aluframe is twisting arround with the screw so it won’t come loose.
Any ideas how to solve this?

 

[Maastricht]

When I installed my dropper post I somehow put the screw wrong to the TCU control panel. It sits there fine now, but when I try to unscrew it I can see that the “nut” attached to the aluframe is twisting arround with the screw so it won’t come loose.
Any ideas how to solve this?

Maybe with a drop of superglue on the rotating "nut"? Not sure if there is a gap so you can come between the frame and TCU?

 

[Mikerb]

In which case the nut has detatched from the frame. One way is to cut the head of the screw off.....at which point the nut and remainder of the bolt will fall into the top tube and you may have fish it out with a magnet. The nut should be re- useable as long as the thread is ok. You will need to araldite or superglue it back into position and you will need a new screw bolt. One thing you could try before doing that is to provide upward pressure on the screw bolt by pushing increasing thicknesses of feeler guage between the head and the TCU. Unscrew very slowly.

 

[Zimmerframe]

Unscrew very slowly.

Have you considered an advisory role at a family planning clinic ?

 

[Webike]

Could be a "captive" nut installed via a pop-rivet type of tool. May be possible to recompress in place, otherwise it requires removal & replacement.

 

[Webike]

Found this posted by Sideshow on the BMW forum:

Riv-Nut installers are pricey. The good news is that you can make a riv-nut installer pretty easily. Find a ~2" long hex bolt that matches the riv-nut thread and also find two nuts of the same thread (insert joke here). Drill out the theads on one of the nuts so that it will slide freely along the shaft of the bolt.

- Thread the undrilled nut onto the hex bolt
- Drop on the drilled out nut onto the bolt.
- Now thread on the Riv-nut until it is tight against the floating nut. Make sure that the riv-nut's threads are fully engaged onto the bolt. You may need a longer bolt if this isn't the case.

- Place the riv-nut end of the assembly into the hole it will be installed into.
- While keeping the riv-nut pressed into the hole, hold the head of the hex bolt in place with a wrench and tighten the threaded nut with a different wrench.
- The Riv-nut should not be allowed to spin while the threaded nut is tightened. This is smash the Riv-nut's base and perform the same mechanics that a riveting gun would.

 

[Mikerb]

Have you considered an advisory role at a family planning clinic ?

Screw that! sounds like work!

 

[CjP]

Could be a "captive" nut installed via a pop-rivet type of tool. May be possible to recompress in place, otherwise it requires removal & replacement.

Same thing happened on my kenevo seat stay nut that holds the brake hose and speed sensor.
I had a nutsert rivet gun already and just reset it and worked a charm.
You can usually buy them from local hardware stores. Mine is a kincrome brand.

 

[Kave]

In which case the nut has detatched from the frame. One way is to cut the head of the screw off.....at which point the nut and remainder of the bolt will fall into the top tube and you may have fish it out with a magnet. The nut should be re- useable as long as the thread is ok. You will need to araldite or superglue it back into position and you will need a new screw bolt. One thing you could try before doing that is to provide upward pressure on the screw bolt by pushing increasing thicknesses of feeler guage between the head and the TCU. Unscrew very slowly.

The Feeler gauges solved it. It was the perfect size to squeeze between bolt and TCU and bend sideways so I could undo the bolt. The nut is conpletely loose so I need to fit a new one.
Thanks you all for your help.