Pointer for Park Tool DT-3 disc rotor truing attachment
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original uses a 1/4-20 acorn nut which was lost, so the truing sounded terrible with just the bare threaded rod
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- Outdoor Sports
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- Creative Commons — Attribution — Noncommercial
Motivation
shop lost the original acorn nut
we were then using literally just the bare threaded rod, which sounded awful against the disc rotor under inspection & often would catch on the holes in the rotor
original tool can be found here
manual found here, see part #4
Design
I ended up printing this as a lock nut to hold the position of my part along the threaded rod
takes a typical ¼-20 nut, press fit into the print
7/16" wide across flats
ultimately it works okay & is much more pleasant to listen to & use, but some printing defects caused the point to be sort of flattened, but I don't really care enough to fix it