the 7.5 will remain and i will work on as i can, that is, pull the powerhead and see what the problem really is. If I can fix it it will be a backup, if not I'll donate it for parts.
I tilted the motor up and eyed it, I think it will just skim the surface of the water, well see - it is a very long shaft.
It came with a standard prop so the seller knocked off the price of a 6 pitch prop from the asking price - my idea and he went along with it - nice guy.
If the fixed mount is an issue I can eventually replace it with a pivot mount.
One thing I noticed is that it's not possible for the prop to hit the rudder at any angle - that's nice.
...and yes, money can't buy health, I was being a bit facetious.