I'm purchasing a 11' air floor Baltik and on the website it states that it's designed for a 15" shaft. The motor I have and want to use is an older Sea Horse. It has 7.5 HP and measures 16 1/2". Will this motor work? Will the extra 1 1/2" make a big difference? The motor runs great and I hate to gret rid of it. Thanks...Sid
