If you have the braze on studs on the frame I find many times the winged screw will bottom out and not tighten up enough. This is due to brazing material working its way in there or some flux or what not build up in there. You can try re-tapping the hole with a 5mm x0.8 tap but be careful not to go to far or it can actually act like a crank puller and yank the stud right off the frame. If that does not do it take the screw to a grinder and grind it down short enough to tighten up properly.
Mike Howard Santa Fe Springs CA
On Tue, Aug 18, 2009 at 1:05 PM, M-gineering <info@m-gineering.nl> wrote:
> Ian Stock wrote:
>
>> I have a circa 1978 Pinarello (Moser) with Super Record kit.
>>
>> The front shifter continually loosens up. I spend half my time cranking
>> the
>> butterfly tight.
>>
>> The LBS suggested Lock-Tite but I have to believe there is a more
>> "authentic"
>> fix.
>>
>> Any suggestions?
>>
>> Ian Stock
>> Toronto, ON
>>
>
> If correctly assembled, there should be a washer with internal flats
> engaged on the shifter boss, which prevents it from rotating. My guess is
> the whole stack is moving with the shifter, thus loosening the bolt
>
> --
> mvg
>
> Marten Gerritsen
> Kiel Windeweer
> Netherlands