This high tech approach to bowing a 4' piece of 3/8" mahogany about a half an inch isn't working. (It will cover my traveller install error.) 3 weeks or so on the rack, so to speak, achieved barely perceptible results. There is probably a better way. Maybe bowing it isn't even necessary. I just don't want it to curl up when only a portion of it is held down by the traveller base.

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