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1969 mercury 650 65hp (help)

im trying to remove the lower unit and not sure how to remove the TRIM TAB ANNODE and also what is the normal compression for this model im getting 120 on all 4 cylinders?:confused:
 
Trim tab bolt is removed thru a hole in the exhaust housing ( from the top ) -------------------------if tools will not work on the bolt, just drill it out. It may be a hex head ( 5/16" I think )
 
There may be a screwdriver slot in the bolt,if it's stuck,heat the trim tab and give the bolt a sharp tap,120 is good and there is also a bolt underneath the trim tab holding the lower unit
 
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