I am well started with my PRO 4896 kit. But I have encountered a problem when I was to install the Gantry R&P Carriage Assembly, the gap between the two steel rails are too big so the Gantry Carriage Assembly cant role on. The V Bearing Adjuster Sled is adjusted up as much as possible, and the steel rails are seated properly in the V-Con Rail Clamp. I'm pretty sure that everything is assembled correctly, so I do not understand what is wrong. I use 12X20mm steel rails instead of 1/2" x 3/4" but both Ahren and Cory from CNCRouterpart assured me that I could use them.

I am attaching a few pictures so you can see what I'm talking about

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