We have a number of boats using the Cradle Shop in Markham, north of Toronto. While their threads are not as robust as some, they do make a good cradle that will be a good winter home for your 33. I have dealt with the shop and they offered me great service when I needed the threaded posts for the pads. My boat is 14,200# and the pad threads have held up just fine, even though they are not those heavier square threads.