Amazon has on sale Innovative Components AN4C-5S221 1.38" Star knob thru hole 1/4-20 steel zinc insert black pp (Pack of 10) $7.36 (0.74 each)
Ships from and sold by Amazon.com
Prime 2 days free shipping.
Best price I’ve ever saw for this knobs. Normally they r around $13-16 for 10 pcs.
Keep in mind, they are WITHOUT nylon locking rings, so it’s perfect choice for any rigs and jigs.
You can use 1/4-20 hex or regular head bolts from Big Orange Box or any other hardware stores.
1/4-20 is a size of hex bolts you can use with t-tracks from Orangealuminum – best cost/quality t-tracks I was able to find on web.
Happy building
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