Bicycle downtube and seat lock.
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Previously:
https://www.homemadetools.net/forum/...970#post187291
https://www.homemadetools.net/forum/...415#post185425
https://www.homemadetools.net/forum/...065#post176241
https://www.homemadetools.net/forum/...389#post166073
https://www.homemadetools.net/forum/...103#post125829
