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A good friend keeps a fair bit of stainless oddments - so I was able to fine some 19.5mm I.D. / 22.5mm O.D. tube - not a fantastically common size? Anyway, perfect for the bearing spacers on my front wheels, which use a 3/4" or 19.05mm axle spindle. These spacers are sometimes called "crush tubes" but you do not crush them. They are necessary to ensure that the bearings do not suffer a lateral stress from tightening the spindle nut, which would otherwise break or wear them in a very short time. I just turned off square ends at 82.5mm long, to suit my 16" Pit bike wheels - just a bees tit longer than the gap between the bearing bosses in the hub.
Might make some further progress on my flyscreen today, too.
Simon
Have fun!
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