straightening left lower frame rail

1st question: '70 Commando has the side stand on the frame rail. Over the years the side stand has bent the left lower frame rail up about 1/4" compared to the right side. I'm planning to use a jack between the lower rail and the junction of the lower head stock brace and the main tube. I would like to put braces between the isolastic mounts, but as you can imagine, none of the mounts are where the frame data says they should be. Ideas on how to get them in there would be appreciated.

2nd question: is there any evidence that the -'70 750 frames were different than the '71- frames ? My frame measures close (+/- 1/4") to the Fig. F4 specs, but using the lower rail as a reference, the rear shock mounts should be higher and the top motor mount should be lower...

Thanks

Greg

Might not want to follow my advice but as there was only local side stand loads bending that one area I'd put a section of wood over it [maybe with tube profiled some so not to flatten the thin top side] and bash it back closer cold work hardening. Might be disappointed by jacking against rest of frame unless you can see its bringing the shock & top motor mounts closer to expected in the process. Its mostly for your own viewing pleasure and ease of assembly anyway not some safety factor on better handling.

Kinda sad. No Norton should ever be kickstarted using the prop-stand as you have found out. It' a prop for temporary parking only. 70 frame crossover underside tube placed differently than subsequent models and prop is shorter and specific to early models too. Yes you can bend it back cold ,no heat, with hydraulic pressure carefully thought out to do the opposite forces . Yes use wood to spread out loads and protect.

Tronto, don't assume that anyone-everyone was kick staring on side stand as can bend over time w/o that level of abuse. Cdo frame is rather more springy twisty than free mild thin steel tube expected and a bit stressing on me to get as brutal as required by bashing forces and long levers and threaded rod spreaders and pullers and clamping down arrangements, I can only try to relieve your mind that if you just get it to look right and assemble pretty straight forward you too can have as smooth and soon isolating and normal handling and tire wear as the World Straightest Commando, as long as no excess slack in iso gaps, swing arm spindle or clutch wobble that chain flop can tug on back into frame/forks. Otherwise might send to one of the more experienced and equiped frame correctors that have posted on their scale of seeking a fully fettered Commando to assembly sweetly and have peace of mind on the fly and close inspections.

Might consider a post on a rafter or robust shop door frame and jack down off it.