Re: Bracket on a 20
The '93 Merc as well as the '88 are both under 400 lbs.
That being said, raise the transom to 25", and go with an extra-long shaft motor.
(15" = short shaft; 20" = long shaft; 25" = extra-long shaft; 30" = extra, extra-long shaft)
And yes, replacing the steering arm needs powerhead removal.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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