I have done some searching and couldn't find an answer. I have started methodically disassembling a 1937 CS ,HW Old Town with original sponsons. This canoe is in perfect condition it has never been apart it had so many layers of crackled paint I decided to do this right. I carefully removed all the canvas trimming closely around the sponsons. Ive taken all the screws from from the inside out and the screws at each end of the solid pieces of the sponson on the outside ,removed all the tacks the only canvas remaining is the 2 layers of canvas in between the sponsons and the planking .I'm able to incert my thin pry bar but there seems to be hidden tacks or screws that won't let me remove the sponson.I'm doing one at a time taking tons of photos. I just quit for the day before I damaged anything.I suppose I have a use a hack saw the type with a single handle that allows me to put the blade in between the 2 layers of canvas to cut whatever is still holding it on. Is this normal? I can't see anything hindering me from separating the sponsons from the canoe on the inside. Anybody have suggestions how to get theses darn things off properly? All is going smoothly otherwise. Not one broken or cracked piece, yet!