The Bike Seat Clamp Feedneck Mod in 2022

[devilzcall]

I've seen a few posts on this, but figured I'd post my own writeup.

I'm modding a Trilogy SF's removable feedneck, which made things easier but is not a requirement. The trilogy feedneck is sized perfectly for a 31.8mm (or 1 1/4'') bike seat clamp, i bought one under 10€ new.


I started things off by creating a 3d printed fixture to help me align my cuts and holes. It uses ikea furniture screws to clamp the feedneck in place.

I drilled the holes first using my dremel and wd40 as cutting aid. Then i proceeded with a handsaw and more wd40.



I made the guiding slots on the jig a bit too wide and some of the cuts don't quite center with the drilled holes but for the most part it looks clean, especially after a pass with sandpaper.

And Here it is on the gun:

[jokers]

From what i can see that looks awesome, some of your photos did not load for me. How well does the clamp hold up on the feedneck? When you take off the hopper does the clamp fall off, or is there enough tension to hold it up?

[devilzcall]

The feedneck was originally way too tight for a modern hopper and gets pushed apart by the rotor, so the clamp just falls off when the hopper is removed. I'll experimant with drilling and tapping for a small screw to hold the clamp it place at a single point.
I also want to hog out some material inside the feedneck, so it doesn't have to bend as far to accept this hopper, but my means to do that are a bit limited.

[NONOBLITUS]

The bike clamp is a great idea.

[JeeperCreeper]

This is great. Im going to try this with a broken feedneck I have somewhere...