Force is Mercury. Mercury uses a splined shaft. On my 1993 Merc when I have the lower off for water pump repair I can turn the shift shaft by gently putting a pair of vice grips on it with just enough clamping force to hold on, then twisting in either direction to shift it. I would think the force would be the same. Try spinning the prop by hand while twisting. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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