That's as good a method as any; it's the way we used to do 'in-service' bottom seal replacements.
Or you can install it prior to assembling the crankcase halves. Put the bottom half upside down on a clean flat surface, and just tap the seal in as above, until its outer edge is just flush with the lower edge of the chamfer in the crankcase bore.
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
