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Yes, I used the gusset blocks. Maybe a thin (.015-.020) steel plate top and bottom of the blocks to add more support to the ends of the bushing would be a good idea. Also remember to add a thin washer or 2 between the tiller and stab to reduce the bearing surface area. and add a note to lube that point every few hours. I imagine the tail takes a beating with the prop blast.
The ribs may not split with the tacks, since they are laminated from 8 layers of spruce. If you have any spares, why not do a test?
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