for oil sealing... i have stopped using paper gaskets...surfaced all joining surfaces on a cast iron table...recessed the threads (they always seem to stick out a bit)..and assembled with loctite 518...similar to yamabond...and..the oil stays .. inside.. loctite 518 makes taking apart very easy...just looks like candle wax... i was using the paper bits..but whether they were in or not in didn,t make any difference..so...why bother...this is on a 69 a65... 50 matchless g/80... 46 b31...and a 76 e-glide...95 dyna..honda posty bike..and a bunch of other unmentionables...works real good... the loctite goo costs way too much...but lasts forever...well...a long time...
the only problem..is with no oil blowing out...i live in queensland, a few miles from a surf beach...is the problem of creeping rust...
but i have solved that too.... i spray or wipe some oil over the bare iron bits... ...
the only thing i use siliy con on is tin primarys...cut a bit of melamine to fit neat inside the outer...then wipe contact areas on melamine with grease... get some better quality silly con... from a commercial glass place...not a builders yard.. there is a big difference...and it costs more... then grease up both sides of the tin cover...screw together..melamine in between...next morn you will have 2 flat smooth surfaces.. mine will hold oil for months... some does ecape..think thru the drive hole...