Looking for advice on oil leak Options

[tornik550]

I recently finished rebuilding my engine. I have a 1.7l case. I have had a fairly significant oil leak. If I run the engine for about 10 minutes, I will get about a 10cm puddle of oil on the passenger side of the case. It was pretty easy trace where the oil was coming from. I ruled out all the routine leaks, pushrod seals, etc. I was able to see that a decent amount of oil was coming from the bolt hole in the case where the engine tin attaches (hard to explain so I took a picture, it was an old picture of my carbs). I am pretty sure it is from that hole however since the tin is in place I cannot be 100% sure. Apparently, the PO stripped the hole and tapped it with a large size because the normal size tin screw is too small. The bolt fits fairly snuggly. I even put a small amount of RTV on to seal the hole however I am still getting a decent amount of oil seeping from around the hole. It seems like an odd location for an oil leak.

I really don't want to take the tin off to see if the the leak is actually coming from somewhere else in the area. Is there anything else in the area that might leak? I really think it is seepage from around the bolt in the picture. Any ideas on how to fix the problem, why I am having this, etc.