When I got the replacement spring shackle pins the end clamp bolt was for a smaller cross bolt than used on the HUP after some thinking about how to increase the cross notch in the hardened steel pins I hit on this idea. Clamping the pins on the tool rest of my lathe and my air grinder to the rest stock on the bead ground the groves to the correct depth and profile. Once the angle for the air grinder was found it was a relatively easy and quick process to cut the new grove profile into all six pins.

Below can be seen the work progressing with all new brake lines being installed. This is a much easier job when the body is not fitted to the frame. If you have choice replace the lines before the body is fitted. Did put the body back on the frame after this step just to check all the clearances.

The engine came back from the machine shop with lots of new parts in boxes, freshly and shinny parts freshly machined. Unfortunately it also came back with a number of unresolved issues that delayed re-assembly while they were resolved. But more of that on the HUP OVERHAUL 2011 ENGINE WORK page.

Note if you are curious why I use maps as clean working surfaces, I have a friend who is head of Triple A auto club and he gives me the previous years out of date maps as scrap paper.