Pinch bolt side-play?

Jon March

We all know that there is "pulling pressure" exerted on the side of the pinch bolts by the "contact point" of the u-shaped groove that is machined in the swing-axle ends.
And if you dont temporarily "relieve" that tension with the proper tool Gord sells, this is what happens when you remove or replace them! ... "groovy"

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But here is my real question: >>> is there supposed to be THIS much play?
I would think with a safety item like this that it should be a slightly tighter fit (>> maybe a "fatter" diameter pinch bolt??
(The one shown is a grade 12 that i was going to use, but ended up using new grade 10 OEM bolts from Gordon Imports -

....but regardless - they both seemed to be the same diameter and have the same looseness in that crucial (and tiny!) contact area. I would think the fit should be a bit higher tolerance - would hate to have the axle work past a too-narrow bolt and slip off the nut broke, etc.

This "play" in these could cause a person to make a mistake in the 1/3rd-turn backnut tightening step - if a person didnt remember to push the stub axle in until the groove hit the side of the pinchbolt

This is my pinch bolt procedure - add any corrections:

pre fill tube with grease and grease brass bushing before fully inserting axle
grease outer washers against brass
DE-GREASE squeaky-clean the polished axle end and inside of oscillating swing arm hole
put oscill swing arm on

insert fresh pinch bolt and screw nut at bottom barely loose for now...

>> NOW: DONT FORGET - put any needed "brakeline brackets" under the head of (new) pinch bolts

Push swing arm tight against buffer disc on flange & brass bushing

push in on stub axle until it contacts the side of the pinch bolt to take up "play"

add fresh Belvedere cupped washers (if desired/needed)
tighten inner large back-nut so that both cupped washers are JUST moveable
THEN: turn inner nut 1/3rd to 1/2 turn - but don't crush them completely

(this SHOULD translate to 3 o'clock rigid-drag friction)

finally tighten & torque pinch bolt nut to 75 lb? & secure with stainless steel cotter pin
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