I use the purple thread locker for drive rods. I've gotten a few for repairs that had the screws back out with predictable results. I personally had my T1 Duplex back out a screw and pole-vaulted off the track when the rod jacked it off the track. I was fortunate that I was running on the straight module and it just flopped next to the track, and not down to the concrete floor three and a half feet down!
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