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Nice work! I've seen 1/4 inch, 5/16 inch and 3/8 inch tri-corner knobs in Bunnings. There is a threaded insert into the plastic body of the knob that accepts a bolt of the respective size. I used a 5/16 knob and re-tapped it with an 8mm tap to accept an 8mm bolt once.
They are approx 3 or 4 bucks each IIRC.
Cheers
Dennis
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