Opus88,
IME a center weight or clamp won't do much for a bad pinch warp. Dish warps can often be flattened, even when playing the concave side, but pinch warps require a vacuum platter or periphery ring.
In truth, if one's arm and cartridge are reasonably good trackers, warp-flattening is not the main reason to use a hold-down device. The main benefit of weights, clamps, periphery rings and (I suspect) vacuum hold-down is to provide evacuation paths for and dampening of intra-vinyl resonances.
The drop in noise floor and improved low level detail and clarity from weights, clamps and rings is much more audible than any flattening of the record - at least IME.
IME a center weight or clamp won't do much for a bad pinch warp. Dish warps can often be flattened, even when playing the concave side, but pinch warps require a vacuum platter or periphery ring.
In truth, if one's arm and cartridge are reasonably good trackers, warp-flattening is not the main reason to use a hold-down device. The main benefit of weights, clamps, periphery rings and (I suspect) vacuum hold-down is to provide evacuation paths for and dampening of intra-vinyl resonances.
The drop in noise floor and improved low level detail and clarity from weights, clamps and rings is much more audible than any flattening of the record - at least IME.