Easy Day
Catalina Direct has everything you need to do this - including instructions and hardware. You do not need to drill a new bolt hole. The problem most people seem to have is that the old bolt has stripped over time. If this is the case, you can fill the hole with epoxy, let it harden, rebore the hole, and put the new bolt in. Recommend you get the appropriate hardware to allow yourself to run your lines aft to the cockpit. You do not have to get everything (deck organizers, etc.), but there is a plate that goes under the new mast step which allows you to attach blocks for your lines should you decide to run the lines aft sometime in the future. It is easier to put it in now, then to pull the mast step back up later on - especially after you've bolted the new step down and sealed it against leaks. Again, Catalina Direct is your best source - they will almost certainly recommend the upgrade when you order.Lastly, I also have a 1979 Cat-22. Did the mast step last year. This year its rigging and sails. Old boat that wasn't too beat up when I got it, just needs some TLC. A lot of the original hardware that is just worn out and needs replacing.Good luck.Scott