Don't worry, they come with no instructions, the problem is that they don't lay out anywhere near 90 degrees when assembled. just said it's ok they shouldn't be square and intentionally made that way i wouldn't take them apart but use the other two factory holes and make them closer to a square. Solving it would be a disaster. Lock washer or nut I will be checking these mounts often. So far everything else seems to be well built with the Pioneer Mini Split. Everything I bought was Pioneer factory including trays to protect and hide the refrigerant lines. Wall mounts would be easy to build, much stronger and smaller than what I would worry about.
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