Due to the extreme shortage of skilled girder fork engineers, does anyone have any experience of truing, straightening or generally realigning bent / twisted girder forks?
I have a set of the ubiquitous BSA M20 girders. Among many other problems they can have (& mine do) is typically one side of the blades is no longer in line with the other (viewed from side) & the axle / spindle slots are then out of line. The front wheel would be pointing slightly to one side or the other when the forks were in line with the chassis (viewed from riding position) . Usually (but not always) it is the lower length of the tubes between the wheel spindle & bottom yoke; hitting rocks, hedges, kerbs or cars hard.
I have heard that some people pull these back straight, cold. No heating of tubes or brazed joints.
My top & bottom link tubes seem to be in line, so that's a start!
Technically I can see ways I could clamp the blades through the top & bottom link castings & other ways to hold one side solid while the other was tweaked. But... as much as I have a practical job, decent workspace & tools etc, I have never done this before.
I am interested to have pointers from anyone with experience of this kind of brutal shed work!
Heating castings to soften braze?
What about straightening any bent tubes individually within the blades?
I am also wary that one of my lower tubes may be close or vulnerable to being cracked through, right where it emerges from the bottom front damper link casting. I can see that if this happens (better in wkshop than on road!) then either re-tubing this side or sleeving internally would be reqd.
Re-tubing looks very tricky to me, involving heating all casting joints to dismantle, in which case the whole lot might as well be replaced