If you want to replace the wiring into the turn signal plug there are four small metal tabs that you can carefully 'unbend' to release the phenolic cover. Then 're-bend them when you're finished.
I made a complete wiring harness for my '51 and have covered some of the points on my project blog at
Larry51's Project Blog If you make a 'former' from a long length (14 feet) of PVC pipe split in half (2 inch diameter is ok) you can lay the wires into it, lace them temporarily (with cable ties) and that helps a lot.
Restoration Specialties and YnZ Yesterday Parts have a lot of suitable replacement items like the correct rubber (non-sticky) wrapping tape and 'friction tape' same as originally used.
It was fairly time-consuming even though I had the old harness to use as a model. But very satisfying and you can save a lot of moolah doing it yourself. I will say though that the price that suppliers of new harnesses charge isn't unreasonable, given the time it takes and the cost of cloth-covered wire, terminals, etc etc!
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