Mike, the oil pickup is supposed to be a snug fit in the case. If it's not you're supposed to peen the case where the tube fits. You can only do that with a split case.
I still can't figure out how you're going to keep any metal filings out of the case by cutting the umbrella.
Maybe use some JB Weld on the pickup tube?
I used a clamp AND JB Weld on my pickup tube extension and had no leaks.