Right pictures of shaped metal as promised.
As mentioned I've widened the rear pivot by 10mm so made a spacer.
Here's the mandrel as normal.
And here it is with the spacer.
Now epoxy is sticky stuff so to expect the spacer to come out easily is foolish, what you need is a tool to push/ pull the spacer out without twisting out of round or damaging the spacer. so 10min on a lathe you end up with..
It doesn't touch any of the mating surfaces and is threaded so in theory I can pull it out using an existing washer, the main diameter is 0.1mm small so should stay concentric'ish.
Also rattled up a spacer for an existing jig part and a new part to hold the rocker connectors in the correct place.
That'll do for today, looks a lot but didn't take that long to do.