etx44,

If my memory is still intact, I think the plate on the bottom of the cover was the factory piece that was spot welded there to give some "tooth" to the threaded bolts that come from inside the crankcase.

If someone drilled and tapped the cover for outside access on those two bottom bolts, that piece should have been drilled for "clearance" diameter on the bolt size, while the adapter would have been drilled and tapped for the proper thread.

If this wasn't done properly, it would certainly leak in that area. Could your ex-mechanic has misunderstood how these bolts were assembled.

Stuart