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Thanks... yes they're still working very well indeed. Same performance as in my post a month ago. I wouldn't hesitate to use them instead of rack and pinion on a 2.5m axis. You'll get better...

George please don't appologise and keeping asking the questions untill your satisfied you fully understand.

The problem with long screws is whip at higher speeds. The only way to avoid it is to...

Here you go George have a look at these. This is one way and my prefered way to build them.
The Obviously the gantry is not showing but the Y axis rails could go either way like I have them or both...