CID
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Speaking of the Standard and DLX knobs - I started with the Standard as it came with the Rotopax DRF sourced (that way I knew it would fit, nothing to do with the mount though).
The problem I had with the Standard was it has to 'turn over' the built in plastic 'stop bumps' but they're so pronounced that I couldn't cinch the Rotopax down without a large Channel Locks and I still didn't feel I got a good, tight fit. Just recently (and probably in this thread), I learned about the DLX and ordered it. I installed it today and, boy howdy, you can get that puppy as tight as you want. I gave the threads a shot of WD-40 before assembly and that probably helped.
The DLX still uses the stop bumps but they're engaged by the lower of the two handles (which is free spinning). The upper handle has smaller lock bumps that engage with the lower handle - since they're smaller, you can crank down as tight as you want. I'm very happy with the new setup.
The problem I had with the Standard was it has to 'turn over' the built in plastic 'stop bumps' but they're so pronounced that I couldn't cinch the Rotopax down without a large Channel Locks and I still didn't feel I got a good, tight fit. Just recently (and probably in this thread), I learned about the DLX and ordered it. I installed it today and, boy howdy, you can get that puppy as tight as you want. I gave the threads a shot of WD-40 before assembly and that probably helped.
The DLX still uses the stop bumps but they're engaged by the lower of the two handles (which is free spinning). The upper handle has smaller lock bumps that engage with the lower handle - since they're smaller, you can crank down as tight as you want. I'm very happy with the new setup.