The washer keeps the center of the record (the label) up just a bit, so when you use the clamp, the edge of the record flattens out against the platter.
On the SOTA tables, you only use it if you have the reflex clamp.
VPI, Oracle and several others use this same approach.
On the SOTA tables, you only use it if you have the reflex clamp.
VPI, Oracle and several others use this same approach.