Gently move the carriage of the stationary rail to the opposite end of its travel. Again this will also move and align the parallel rail.
Once again, slightly tighten whichever M3 bolt is closest to the carriage on the parallel rail.
Slowly run the carriages over the full length of travel, check for any increase in resistance or any binding. If the travel is smooth, begin to tighten down the remaining M3 bolts on the parallel rail. Remember to check the travel frequently.
Once all M3 bolts are tightened, you are done and both rails are now parallel to one another.
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