My money is on the starter windings. You said you were cranking her for a long time. You just might have burnt them out. If it were the solonoid you wouldn't get the click of it engaging... (shooting the gear forward to engage the flywheel). But since you say you are getting that sound but the engine is not turning over it tells me that the starter motor is either not getting juice (burned contacts in the solonoid) or that the starter motor is burned out. IMHO
And if you want to turn the engine over you can always put a socket on the crankshaft damper pulley and give a tug with a breaker bar.
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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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