XR75 fork improvements

I've got several sets of old 1977-82 xr75/80 forks. Whats the cheapest way to improve the damping on these? I saw that xrminiracer had air caps, would these help? Also, whats the best way to straighten a bent tube?

I haven't tryed it,but I thank you can weld shut one of the holes on the damping rods.It maybe better to partialy block a hole,or just use a heavyer fork oil.I just put Motul 20W in my 100,and it made a huge difference.30 or 40W may help even more.

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