It could also be that the record is pulled down when the vacuum takes hold. since this is done after you lock the clamp a small gap results.
When I used the lock on the clamp, I would just press down slightly while locking the clamp. This resulted in no gap.
With the latest Cosmos, I took SirSpeedy's recommendation and simply use the clamp as a weight. This works well and is easier to use.
**The clamp is adjusted so it just lightly grips the spindle when applied. In fact, you just slip the clamp over the spindle without opening or closing the latch.
When I used the lock on the clamp, I would just press down slightly while locking the clamp. This resulted in no gap.
With the latest Cosmos, I took SirSpeedy's recommendation and simply use the clamp as a weight. This works well and is easier to use.
**The clamp is adjusted so it just lightly grips the spindle when applied. In fact, you just slip the clamp over the spindle without opening or closing the latch.