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I usually start with the motor side, bottom the rail out in the motor X end, put the plate on, measure for square with a 90 degree block or a t square or something along those lines, then lock it down and tight with the bolts. I then install the assembly and square the other side. One of the Lulzbot forum users was able to find them in Germany using the information in this post https://forum.lulzbot.com/viewtopic.php?f=16&t=2897&p=26813&hilit=heat+set+inserts#p26813