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On semi auto pulling ONLY once every few seconds, blocking the nozzle completely can provide a valid test for air leaks. If your piston still smacks forward with the nozzle blocked, you've got air leak(s) somewhere.
On full auto, you strongly run the risk of the sector gear coming around to pick up the piston before it has fully returned forward which can cause some bad crunchy things to happen because the teeth don't mesh right.
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