Well, assuming the SR is like all the other one-bolt units out there
that I've worked on, if you're willing to modify the surfaces a bit,
here's what one shop owner taught me about a quick and secure fix: Cut a
piece of medium sandpaper to fit the mating surfaces. Install and clamp
down. Bingo! Instantly there are hundreds or thousands of contact
surfaces supplementing the inadequate serrations. Heck, even if you use
paper-backed sandpaper and it gets wet, the grit, pressed into place,
isn't going anywhere. Of course, now the scrapes on the shaft are joined
by tiny pits where the sunlight don't never show... It's still "almost
NOS" for eBay. :-) harvey sachs mcLean VA. (This trick was so obvious
after he showed it to me that I slapped myself upside the head). Nick
Zatezalo wrote:
> How does one tighten this rascal so it does not slip. I have tried brute
>> force
>> and the clamp is still slipping enough to make the nose of the saddle
>> raise
>> about an inch during a ride. I am using a Selle San Marcos Regal saddle
>> and it is clamped near the front of the rails.
>>
>
>
and David Snyder responded:
This post's clamp relies on the bolt tension to create a wedging effect,
increasing friction on the sliding, canted surfaces.
Mine has slipped in the past, and the best I could do was clean the surfaces
with solvent (alcohol) and lube the bolt's threads.
Mine came with an alloy bolt, fwiw, and now it doesn't slip.
I would want to be certain, as with certain other items (like seat binder
bolts), that the bolt or bolted assembly isn't somehow bottoming out before
all the bolt's tension is fully applied to the friction surfaces. I hate
when that happens!
Perhaps some slight roughening (and cleaning) of the friction surfaces might
also help. You might also want to confirm that the lower cradle isn't
cracked.