When I did my Old Town I stretched the canvas using the tow hitches of two SUV's for anchor points but the wrong way up. I cranked it in with ratchets with everything creaking to the point that I thought the canvas may tear. I then pulled down from the centre with wide pliers rolling inwards to add tension before firing staples in. This was repeated each side along the whole length of the canoe.
I couldn't hold my beer glass for the next 3 days as my hands and wrists ached so much. We will see how it stays as temperature in the garage where I store the canoes varies considerably over the seasons.
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View attachment 47996
Nick