Banana - Cold Setting Frame (widening) with pics.

I'd echo Keithglos' remarks. I did a similar operation to re-space my Witcomb. Simply widening the back can leave the rear dropouts out of parallel. You may need to bend the rear ends inwards a little so they are parallel all along.

I used the lever approach (Sheldon Brown) working on each side to ensure that the widening was equal. The right stay can bend more easily if it has the chainring depression.
 
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I used the Sheldon Brown plank method as well for a few bikes of mine,it worked well with me, I also got myself a cyclus dropout alignment tool just to tweak the dropouts, I’ve used friction shifters with 10 speed cassettes, and it works a treat with just a little practice you can get very fast clean shifts,
I won’t go back to index shifters.
 
Someone has over enthusiastically widened my Elswick, I'll measure it so you see how not to do it and so you can all have a larf.
 
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I tried this method on my bike....

One stay spread more than the other leaving an asymetric backend!
I ended up using the plank method instead.
Having said that there are better (more expensive) tools for the job.

:-(

It's really worth adding another couple of tasks to your coldsetting:

1. Checking frame alignment after the coldset.
2. Realigning the dropouts post setting.

viewtopic.php?f=23&t=372988&hilit=gillott&start=40

A few pictures of the same here. Can be done on the cheap too!

:)
 
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