Did the seal yesterday after a primary full of engine oil overflowing out the drive sprocket opening, getting over everything. The bike had wet sumped to below the oil tank pick up sieve. I kicked over engine 20-30 times to help start the return feed and added just a bit of fresh oil to cover the sieve before real start up. Ran good but noted the spew some 50 miles later. Here's what the 44+ year old seal looked like: Completely blown in half as I found in shaft. Put fresh one in (same OEM type, not a full plastic type some recommend) and used Locktite 515 gasket sealant tween metal flange and casing. This stuff is basically Krazy glue with a filler. Should be as good as JB Weld epoxy some advocate here.