I use duck oil, spray and gently brush with an old tooth brush. Blow the crap away with compressor and repeat till clean and moving freely.
(use WD40 if thats what Lampkins recommend)
gear oil in the plug in the middle of the engine.
atf in the outside casing (clutch)
If you cant get a gasket, take the casing off, clean surfaces of old gasket/goo/oil, clean again. Use clear silicon (my preferance is sanitary silicon