I bought 20mm picks. I had two problems: the spec clearly states that the screw holes (d1) are 6mm in diameter, meaning M6 screws will fit, but the screw head hole (d2) is only 9.5mm, which is smaller than the standard size for M6 bolts, usually 10mm. I need to use M5 screws in a 6mm hole. They have an 8.5mm head that should fit! It would be nice if the rail hole sizes supported standard studs! Second, the fins were 3mm longer than advertised. I didn't allow that and I have to try to grind them to the right length. I'd rather have them a few mm shorter than longer! Both are my problem - the rails themselves are fine!
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