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Improved Flap Valves by John Smith |
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As the flap valves are inaccessible once the bellows have been covered,
John Smith has given the following tip to ensure correct operation of the
valves:
John suggests replacing the shorter, rounded strip of soft leather with a strip of the same material (or the blackout material) about 6 to 7 inches long, and 1 1/4 to 1 1/2 inches wide. This is to be laid over the inlet holes and fixed at both ends with a small strip of wood and glue - as in the plans. The material should be not stretched, but not too loose, either - just laid flat on the board and fixed. It only has to lift about 1 mm or so to allow air to pass in sufficient quantity. Johns suggests that this method could be used for all the valves, and would produce a more consistent and 'quicker' action, resulting in better air pumping.
John Smith
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