3/16" is standard. 7/32" is the old standard. If you use 3/16" make sure you use a drill press. I clamped a baseplate on as a jig, using a hand drill, and it still didn't line up correctly.
Didn't trust my memory so I remeasured everything. Ya, my memory has been sucking lately.
I could only find my crappy drill set and it's missing 7/32", doesn't have 13/64".
Checked a few decks and 3/16" is a lil small or just about perfect.
Loose on a lightly used Dwindle, loose on a few year old unridden PS Stix, snug on a new BBS,
really snug on a Powell Quicktail, loose on an og Kingsize.
Measured the holes with calipers and..
(Used) Dwindle is in the 0.205-0.210" range, and that measurement should be a lil small. PS Stix 0.210-0.220". BBS 0.195-0.200"..
Ps Stix was assembled so maybe the bolts loosened things up? Overall it is a real lemon of a board.
Base plate holes are ~0.205", but again that measurement should be small..
7/32" = 0.21875", so that's pretty close. I can't think of anything closer besides maybe a # size.
5.5mm? That's 0.217"
5mm = 0.197"
3/16" or 7/32" would be the cheapest/easiest to find options.
A "magic" Diamond bolt is 0.185" at the shank so 3/16" (0.1875") fits hardware better.
Some info on screw/drill size. You want a 0.196"-0.201" hole
http://harveytool.com/secure/Content/Documents/Chart_ClearanceHoleDrillSizes.pdfhttps://en.m.wikipedia.org/wiki/List_of_drill_and_tap_sizesAnd cuz you said jig..
A small woodshop called Churchill used to sell a steel "rider pad" with 8 holes as a redrilling jig. They'd clamp 2 of them together with a steel tube for alignment.
I think it was 1/2" or 3/4" thick, drilled for 1/2" wb change. They go by funbox now.
https://funboxskate.com/And there's this crazy jig
He uses a #11 (0.191") bit
http://www.peterverdone.com/that-tool-youve-wanted-for-about-35-years/