I don't use 2-56 barrels....the pivot barrels are 6-64 as I recall.
I use 2-56 screws to hold the scales to the liner frame.
fancy hardware I get form Steve Kelly at Ticonnector
most other screws etc like 2-56 screws I get from RB Johnson 320-558-6128
most screws and barrels have to be ground down to size/length...
I don't do countersinks, I counterbore for the screw head to sit lower or flush.
Is it a big pain? every operation on a slipjoint is a chance to screw it upevery operation has to be thought out, planned and setup properly or it doesn't go well.
these are examples of the pivots I get from Ticonnector
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I am looking at ticonnector site and smallest diameter pivot i see is 1/8" threaded for 2-56
https://ticonnector.com/product/18-plain-416-stainless-pivot-barrel/