[Yak] Shimano B screw and guide pulley drag?

[Geof Gee]

Maybe putting a screw on the other side of the b-screw home will prevent it from 
sliding off the stop since the head will have more surface area than the 
inserted side of the screw ... so as you screw it out, there is more b-screw 
adjustment.  You can also try a screw with a flat top.

Given that the screw comes off the stop, I'm thinking that the hanger might be 
bent a bit.  
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________________________________
From: j harris <jaylharris at gmail.com>
To: yak at bikefriday.com
Sent: Sun, April 17, 2011 3:41:22 PM
Subject: [Yak] Shimano B screw and guide pulley drag?

Howdy all,

            found an interference between the chain, the largest (32t) sprocket, 
and the derailleur guide pulley on my wife's spare bike the other day when I 
foolishly looked at it. I believe I would have seen this before, so I think this 
is new. the bike is a lower middle class Raleigh mtn bike, low level Shimano 
(Acera) components.

I cranked the B screw all the way in, and while it made it a little better, it 
didn't cure it. The screw/stop geometry causes the screw to start sliding off 
the stop when the screw is all the way in so trying a longer screw didn't help.

I looked at the derailleur hanger, and it appears undistorted. I put on a new 
derailleur, same problem. Other than ignoring it,  as

1. it's not a bike I ride, and

2. the interference only happens in in fattest sprocket


I'm out of ideas. Any thots here? Thanks

Cheers from Fairbanks

             j
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