Sid here . Not sure I ever mentioned this method of easing in very tight fits like assembling flywheel assemblies , pressing steel into steel . Go to your Druggest and obtain a small amount of Anhydrous Lanolyn . This is a grease form of oil from sheep fur . It has a. Miraculous film strength , a very LIGHT smear on tight fitting surfaces allows amazingly easy pressing home . Do stone off the entering sharp edge first of course . We used it to press Gunga Dins single diameter stepless crankpin home . No nuts , no recess . This at 5 thou interferance fit . Would have been hugely difficult without that trick .
Discovered this method back in the fifties reading an early BMW manual which called for a smear of BEAR grease to assemble crank shafts . Then learned the Navy used Lanolyn for such heavy fits aboard ship .