A little while later... where does the time go??
Here is a straight edge I found in the garage, clamped to the flange on the swing arm...
But it’s too flappy so no good to measure off.
Here’s a laser pointer clamped above it by my good pal Heath Robinson.
Shining along the length of the straight edge...
...and raise the beam up to measure off to the chassis rail
Get it parallel and check the bolt positions

So that, I think, indicates my laser concept works!
Here’s the rear JP from inside
So, take the inner sill and swing arm off, knowing that when I refit it I can get the rear JP on a good position, and next - chop back the rear crossmember to clean metal prior to rebuilding in two stages (i) the upper portion that the sill fits to, (then refit sill and JP) and (ii) the lower portion that the JP fits to.
Also need to clean up the inner swing arm mount so it’s ready for use. Looks crusty but it does seem to be clean around the bolt holes. Fingers crossed...
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