Shimano Deore Thumbshifter Rebuild/Mod Guide

[frkl]

Does anyone know what this mod is? Post is so old that the picture has disappeared. Trying to use an m732 thumb shifter on dynasis. Interested in the mech mod to reduce the amount of cable pull in total so the shifter doesn’t have to move 180 degrees. Or maybe I’ll just sack it off and use 10sp shifters

I use m730s over 8 speeds and there is more pull available than I need within normal rotation. I know that dynasys derailleurs need more pull, but the cogs are closer together so even with more speeds, the total might still be in range.

The hacks that move the connection point of the cable closer to the pivot are difficult on some dynasys derailleurs because the cable attaches to a lever extending off the back of one of the parallelogram plates, rather than attaching to a tab on one of the plates. I don't know if it is like that on all of them.

To get the cable closer to the pivot, you might have to reverse the bolt so that the cable attaches to the back (inboard) side of the lever. But watch out for spoke strike, because that lever gets pretty close to the spokes sometimes. You might also be able to drill a small hole in the lever, or use an existing hollow spot, run the cable through it, and then attach it to the bolt as is. this would probably cause excessive cable wear, though.

Another possibility, which I considered with the m730s before I realized they worked fine over 8 speeds, is padding the shifter drum itself. you could increase its diameter by lining the grove in which the cable sits.

 

[NeilNeilOrangePeel]

I just want to say thank you to all that created this thread, without it I would have two badly performing shifters, which i would have probably sold on. I did manage to break the left internal thread (righty-loosey!), but by luck someone was selling another one with a broken lever, now combined into a working shifter. The right was ok other than being filled with crud, now cleaned and crisp. Thanks people!

 

[MoxieBC]

Does anybody know what the thread sizing is for the top cap on 7spd mountain lx? Threads are ruined on both of mine and wanted to either machine or 3d print a replacement but not sure how easily I could measure the thread while the shifters are on my bike.
@Thias I saw your cover, did you use the original screw or replace it?

 

[elite504]

The top cap is held on with a self tapping screw. Remove the shifter from the mount and up the bore for the retaining screw, you will see the cross-head of the self tapping screw for the top cap.
If the top cap has pulled off, perhaps fill the topcap bore with epoxy, let it cure, drill a tiny pilot, and then try again with the original self-tapping screw.

 

[MoxieBC]

The top cap is held on with a self tapping screw. Remove the shifter from the mount and up the bore for the retaining screw, you will see the cross-head of the self tapping screw for the top cap.
If the top cap has pulled off, perhaps fill the topcap bore with epoxy, let it cure, drill a tiny pilot, and then try again with the original self-tapping screw.

Ah didn't see that it was self tapping. Not sure if I have any epoxy but should just be able to 3d print a solid chunk and drill the pilot hole in that. Thanks for the info!