Record Clamp
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Record clamps help level and stabilize records on the turntable platter. They usually run $25 and up. This instructable shows how to make one for a dollar.
Obtain a Hockey Puck
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Pick up a hockey puck with standard weight.
Find the Center
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Use a caliper and compass to find the center of the puck. Mark the spot.
Drill
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Drill the center through with a small drill bit and redrill the hole with larger bits until the hole accommodates the spindle on your turntable.
Set on Record
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At this point you could add metal to the puck to increase weight, but I find the compression sufficient. You could also paint the puck or add a bullseye level to the center for a few dollar.
Play a Record
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Place the record weight on a record and give it a spin.