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Spring-Loaded Toilet Paper Spindle
A one-piece replacement spring roller for a wall toilet paper holder: a 22 x 22 mm square spindle (31 mm across the diagonal, so it spins freely inside a 44 mm cardboard core) with a monolithic serpentine flexure instead of a steel coil spring. It is 157 mm long at rest and compresses 10 mm to 147 mm, so it drops into holders with bracket recesses 147-156 mm apart; the 12 mm diamond end nubs self-centre in round or square recesses and print with no overhang past 45 degrees.
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