When I had done this task a year ago a groove was warn on the crank so I fitted a repair sleeve. The key I noticed did not want to stay put in its slot and would push out the back. The key actually fell into the sump which I could retrieve by removing the side oil sump. I used a punch to stamp both sides of the key so I could tap it into the crank channel. That was enough to keep everything in line while tapping on the hub. A loose key will present issues. I never encountered excessive force to reinsert the hub once the key held firmly.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10