I've had a problem with my trusty A10 wet sumping for quite while so, about a year ago, I fitted an anti wet sump valve which cured the problem. The oil return has always looked a bit feeble so I decided to take a sledge hammer to the problem! I know the original anti wet sump valve is in the crankcase half and I couldn't be bothered to strip the whole engine down to fix that. Even if you do a complete strip you don't know if you've fixed it until you've built it up again! So, I've fitted an SRM pump, on the assumption that the new pump, with tight tolerances, should prevent oil leaking into the sump, and I've removed the auxiliary anti wet sump valve. So far, so good! However, because I wasn't sure whether this would cure the wet sumping, I thought I'd fit an alloy sump plate with drain plug so I could drain the sump easily and measure sump contents after a week or so. The problem with the alloy sumps is they require you to retain them with allen screws. The problem is that the threads in the crankcase are short and every time you tighten an allen screw the threads are weakened. I've got loads of crankcases with knackered threads in that area. So, I've drilled the new sump plate with a 9.00 mm drill, but not all the way through, and used tappet cover nuts and 5/16 spring washers to secure the new sump plate. I skimmed the tappet cover nuts down to accommodate the washers and the resultant job is great! (Even though I say so myself!). So, I keep the original studs in situ, and the tappet cover nuts provide a greater thread-to-thread contact than the originals... nice, tidy job. I've given the bike a short run and no leaks, and over the past four nights, no wet sumping! Just getting a beer from the fridge!