then it did change at some point...
My O'Day 22 is a '72 model. It has the (what I thought was the only type) cast aluminum, slotted, upright, tabernacle bolted to the deck. It has two slots cut out to take a hinge pin which juts from the mast a couple of inches on each side. I was asking, because I saw the pic just before I took a three hour trip to PA to pick up an O'Day 22 mast... and I got nervous, thinking it may be the wrong type. As it is, I got lucky... the method on the mast (I bought it) was the same as mine.The owner also had a complete '75 O22, with the aluminum casting/pin arrangement. So I suppose it changed sometime between '76 and '79. Thanks, Stu... Rich.