Haoge LMR-OM415 Lens Collar Replacement Foot Tripod Mount Ring for Olympus M.ZUIKO Digital ED 40-150mm F2.8 PRO Lens Built-in Arca Swiss Type Quick Release Plate

I recently purchased a used Olympus 40 - 150 f2.8 Pro lens, which was reduced because both the lens hood and the tripod foot was missing. I noted in the reviews that some people were having problems with getting the lens to be gripped solidly by the clamp. As there are no alternatives to this device, I went and bought one anyway.On arrival my copy had the same problem as others had described and so looked how to improve the lock. I first tried a thin elastic band around the lens inside the engagement pins, this worked, but I was concerned about longevity.On closer inspection I realised that the circlip that prevents the locking screw was preventing the clamp from closing to it's utmost. I dismounted the lens, removed the circlip and reassembled everything. Now the clamp closes fully and grips the lens securely. I next disassembled everything again and placed the circlip on a flat part of a sharpening stone, then ground off the paint and a small amount of metal using my finger to grind the circlip in circles. After reassembly the grip was stronger, but still not achieving full lock. I had a couple of more goes and eventually settled on a grip that needed a large amount of force to make the lens rotate. If you must have a full grip just remove the circlip, but look after the clamping screw and circlip, if you remove it. However, how often is that likely to happen and why would you anyway?