mtbchip <[email hidden]> wrote in message news:<[email hidden]>...
Quoted message said:Cut too much steer tube...other than buy a new fork, what can be done?
I am almost sure (if this advice has not already been handed down)
that Marzocchi will press in a new steer tube for you. This mistake
will cost you some dough - shipping both ways, the new steer tube, and
the charge to press it in. I'd skip the liquid nitrogen advice, too
much to go wrong, and plenty of ways to hurt/cold-burn yourself.
Chalk up the expense of the replacement to a lesson learned.
The advice on how to measure and cut is the best I've heard so far:
With fork race installed, slide the steerer up through your
already-installed headset, slide any spacers on that you need, clamp
on your stem, measure down from the top end of the steerer. Add *to
that* measurement 3mm (some stems, like Thomson, require more
clearance 5-7mm, IIRC). Mark the steerer with a pencil or Sharpie,
then measure the top-of-steerer to stem again to verify your first
number. Take the fork out, then measure it again, to see if the place
you actually want to cut is actually 3mm below the line you drew. If
so, make a mark at that 3mm-below line. Wrap some tape around the
steerer such that an edge is *between* the low mark and the high mark.
Cut the tube (I prefer a hacksaw to a tubing cutter.) File the cut
surface smooth and perpendicular to the long axis of the steer tube.
Give the outside edge a little chamfer such that it'll go up into the
headset more easily. Make sure to wipe off the filings and cuttings
so you don't get any of that into the headset grease. Take off the
tape, and re-install the fork into the headset. You should still have
a little more to file down, but a steel file on an aluminum steer tube
is knife-through butter quick. After you have filed it down to where
it should be, then re-install just to check. Knock in the
star-fangled nut carefully, and you're ready to put it all together.
I use a 1" chamfered wooden dowel to set the SFN. Made it myself out
of 1" dowel stock. 🙂
Last time I did this, it took me less time to actually do it than to
type this set of instructions in. Steel hacksaw blade, and steel
file, on an aluminum steer tube really makes the job go quickly. It
really is simple, and I've not had any problems doing it this way.
The key is to measure, write it down, measure it again, write it down,
and check the measurements against your calculations. Even if you
feel silly doing it, use your calculator for an "numerical sanity
check." Cheaper than having a new steer tube pressed in! Quicker,
too.
I like to do things in millimeters, because then I don't have to deal
with any fractions. Playing in inches and fractions just begs for an
error.
I got this advice from a shop guy over a few beers. Cost his shop
some money, that guy. 🙂
--
Jonesy