130mm wheel in a 135mm frame

Genuine questions re the home made approach shown above
1. What stops it all springing back to the original when the threaded axles are removed?
2. How to control one side not moving more than the other resulting in an off centre back end
 
1. You have to over tighten it. I had it tightened to approx 115mm and it bounced back to 132mm rather than original 135mm. I tightened and loosened it several times gradually going further, it was only when I got to 115mm that it started to work.

2. My chainstays were identical so I wasn't too worried about this. I checked alignment before and after. If the chainstays were different I probably wouldn't have attempted it this way.
 
2. You can use a big length of wood as a lever to bend each chainstay individually. Lots of people think this is the best method anyway.
 
I find using soft jawed spreader clamps over the chainstays about where the outer edge of the top chainring is and one a few inches below break bridge in unison with the threaded bar technique...ie threaded bar stretches and clamps crush.
Doing this reduces potential tweaking at weld or lugs 😉 And as someone else posted you must reset the drop out faces to be parallel/square with each other or you'll be bending the axle and ruin your hub bearings ...it will also make the ride feel very skittish and nervous!
The final thing is your derailleur mount.....that's the fun bit .....if you want gear shifts to be crisp and sweet this again has to be square to axle.my weapon of choice is a bit of 6mm thick angle iron bolted on and checked against wheel rim edge... check every 45 degrees ..obv your wheel needs to be 100% true!

You'll know if you've got it all right ...does the bike let you ride no handed? If you have to lean in the saddle to do so then you'll need to check it all over again!

As a rough rule ive found on cromo frames the dropout width your after you'll need a nutted type axle that corresponds to the hub that you want fitted has just enough thread for the spread!
Last point if it's an aluminium frame.... don't... Just don't even think about it...no!
If it's stainless or titanium..? Really 🤪?
 
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