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Attention mechanics! HIghly technical question(11 posts)

Attention mechanics! HIghly technical questiontmguy
Nov 21, 2003 8:30 AM
What size tap to chase threads on fork eyelet to mount fenders? I have a new Surly CrossCheck and the paint is too thick to try an chase with just the bolt. I already mucked up the first thread trying to thread the bolt and zip ties aren't enough to secure the fender to prevent rubbing on the bumps.

Thanks for the help!

if no one here knows, Sheldon Brown mightDougSloan
Nov 21, 2003 8:36 AM
It would be the same as a watter-bottle mount bolt...nmSpunout
Nov 21, 2003 8:47 AM
Quick-fix tip...Silverback
Nov 21, 2003 9:07 AM
It's the same as a bottle-cage bolt on my bikes, too. A trick I've used (carefully) get get that paint out is to find a drill bit that will JUST fit into a clean hole (there's one under your water bottle), then twist it into the clogged hole by hand. That generally cleans out enough of the paint that you can get the rest with a bolt, and you can't generate enough force with your fingers to screw up the threads.
Nov 21, 2003 9:28 AM
Just measure the bolt (nm)TimA
Nov 21, 2003 8:51 AM
5mm x .8mm nmDougSloan
Nov 21, 2003 9:30 AM
I knew someone on the board would come through! Thank you!(nm)tmguy
Nov 21, 2003 11:19 AM
Any more questions, contact Surlypitt83
Nov 21, 2003 11:51 AM
I must have emailed them 4 times about build quesions for mine. Andy happily answered all of them. From the tone of his messages, he likes customer interaction and is willing to help.
if you don't want to buy a tapdesmo
Nov 23, 2003 11:36 AM
just get the right size screw and grind a couple of flats across the threads (look at a tap for guidence) and taper the front of the screw so it can easily be inserted. the flats will allow waste material to escape without clogging up and damaging the threads. dress all the threads you ground on sharp with a small file. grease the screw and work it into the threaded hole, 1 turn in half turn back, repeat until it threads in smoothly.
SAE size 10-32 also workstmguy
Nov 24, 2003 8:38 AM
If you read Sheldon Brown's article, he says this is the equivalent to the 5-.8. I went to Sears (Lowe's had nothing even close!), bought the 10-32 and t-handle as recommended ($9.94 investment), and voila, I now have rattle free fenders secured with stainless-steel bolts.

Thank you Doug for pointing me in the right direction!