One of the things about a Permanent is the adjustable pillow blocks on the changers, which means that you don't have to drill accurate holes to center the changer relative to the 12 fret. Adding the 11th string meant the holes were too close to the edges and the pillow blocks got damaged. Instead of 1/2" axles for the 11-string changers, 5/8" axles were used which meant that the strings were 3/4" above the fretboard at the bridge, however, the height of the roller nuts, on the keyheads, was 7/16" above the fretboard which meant that there was a 5/16" incline on the strings. If I let go of the bar at the 15th fret, it would break the speed limit by the 3rd fret. So...first I needed to make new pillow blocks which also meant picking up the hole patterns, on each neck, relative to the center of the axles to the bridge and the 12th frets.
Then I had to add metal to the changer housings to widen them for my pillow blocks and so that I could countersink them 1/8".
Next up, add a 3/16" plate to the bottom of the nut
rollers, which means picking up each key head's hole pattern and drilling it into the jig that the pieces will be bolted to when they're welded back together.
The end braces that held the legs and the changers were supposed to bolt to, needed to be replaced with machined pieces, which also meant picking up the original random hole patterns.
While I was at it, I decided to machine a "rod holder" for the front.
The lowers for the Permanent changer are spring release. The lower assembly, on the left, seemed excessive so I machined a replacement.
Killer job Chas, great work.....Stormy 
