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Original Message
RE: The subchassis ... here's the pic
Posted by 13th Duke of Wymbourne on August 11, 2017 at 17:38:02:
The springs hold up the sub-chassis from the bottom of the bolts (springs in compression). The platter and arm board attach to the sub-chassis so they are isolated from the bolts. To a first order, whether the bolts are held from the top (with top-plate attached to a plinth) or whether the bolts are supported from the bottom (as in this case) is the same for the floating stuff. If you push the center pin the platter will still bounce up and down in typical LP12 fashion. The motor is still attached to the top-plate so is 'grounded' through the suspension bolts rather than from top-plate through the plinth. The motor is isolated from the platter, as always, by the belt compliance.
13DoW