Bended ballscrews. What i can do?

[auhopu]

After finding this topic, I thought to give it a go.

As numerous people with Chinese rolled 1605-C7 ballscrews, I have to somehow deal with bends ...or live with them. In my case, we are talking about 3 items of 720~780mm lengths and 0.54~1.32mm runout (the latter can be seen with naked eye). This is how I am trying to deal with it.



After finding the high spot, I have tried several variations:
- v blocks at ends, quarters, 100mm and 50mm from high spot
- bending down by 0.5*runout, 0.6*runout, 1*runout, 2*runout
- applying force for 1m, 2m, 10m, 1h, 10h

Of course I have not tried all the combinations of the above and I have lost track of what combinations I have actually tried so far. I am trying to deal with the worse runout of 1.32mm and after a couple of days I am down to 1.21mm. I would not call this a progress.

Therefore my question to people that have had (some) success in the past is whether they remember what recipe (v block spacing, amount of bend, time of bend) started showing results.