Mr. Pinball Tip:

Adjusting blade switch gap--Generally switches should be gapped about 1/16", but this is not absolute. The gap should be such that when the switch is fully closed the stationary switch should be perceptively moved. This ensures pressure on the contacts. The normal action of blade switches provides a slight sweeping motion between the contacts, which under normal conditions, will keep the contact points clean.

Note that if you cannot achieve about 1/16" gap and the slight movement of the stationary switch, you probably have a mechanical binding problem where something wrong.
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