Roger Hicks
Veteran
I start 120 film into the grooves but do not try to push it past the ratcheting balls. Instead, I take my thumb and forefinger and pull the initial edge of the film through. Then I ratchet the remaining 99% of the 120 roll onto the reel. That has always been bulletproof for me.
35mm I can push through the ratcheting ball mechanism but 120 I just pull.
Seconded.
Cheers,
R.