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fucking machine experience
Having built various powered machines which require a great deal of mechanical and electrical skill and engineering resources, i tend to agree that the way to go is the heavy pendulum. I have used an old flywheel with some attachment points, two vertical bars are bolted on for stability ( otherwise it flops around ) and the dildo is on an adjustable spring mount to adjust the angle of attack. Cords are attached to each side and are used to get the swinging motion going and keep it going. The dildos are made from pool noodle material shaped on a belt sander, where you are only limiter by your imagination. Gas quality baloons (with the rings for blowing them up cut off) are perfect for getting a nice smooth finish. i screw a 150 mm long x 10 mm coach bolt into the pool noodle material and i have drilled and put an 8mm thread into the hex end of the coach screw. With regard to powered versions i am happy to send details but essentially I have used a sliding gate drive motor which has a powerfull gearbox and is 12 volt so can be speed controlled and has the element of safety.
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