[Wisconsin Retiree]

That was the benefit of threading the bolt from top down instead of bottom up. The bolt head gives stability from rocking back and forth when pressure is applied while sliding door back and forth. The original way seems to put alot of leverage on the threads causing them to slowly back out or loosen stripping the threads. I suppose a nut on top could assist in helping out but over time it may still loosen up??? So far, the way I have it the lock nut and jam nut tightened together at the base have not allowed the bolt itself to turn or back off at all. My door slides open & closed smooth as butter and as of yet never loosened up...this is the best it has functioned ever. Time will be the true test but so far so good and people are not struggling with opening or closing the door as they have in the past....