^^^ This ^^^
When I did the seals on the Mule, I bought a .015 single blade 'feeler' gauge ($ .85)
took 400 grit sand paper & rounded all the edges (smooth to feel). applied a little oil
to the gauge & made double sure I had not rolled over either seal lip.
---Cause--- well I did have to do the repair twice !!! lol at Myself !!!
But, Hey ! now I have another special tool !