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ive had a brand new bearing give me nightmares on my Y axis ballscrew, it was on the floating end of the screw

randomly it would start to shudder for a few seconds and then go away, it took me...

To maximise the strength of the bolt in steel you need to go in 1 1/2 times the diameter , m8 = 12mm. The bolt will snap before the thread pulls out
In ally it's 2x the diameter

But on a rail...

the joys of third world :-)

RICE is your friend ! for electrical components you will be amazed how the stuff just sucks the moisture out ....

however ive only used it on smaller stuff, phones etc ... not sure how a...