There are three Inner Envelope Openers, that typically need length adjustments only. But, when needed, these (except the Middle Opener) can be moved laterally.
If using windowed envelopes, loosen the thumbscrews that secure each inner envelope opener.
Position the inner envelope openers so they do not touch the edge of the window. In unusual circumstances, such as vertical windows, you may need to place the opener on the window to prevent the opener from catching on the window's edge.
Tighten the thumbscrews for the adjusted openers.
Press down, then pull one of the knobs on the top of the frame, to determine how far the the insertion edge of one inner envelope opener goes into the envelope.
If necessary, loosen the knob on the insertion edge of the inner envelope opener, and adjust until it goes at least 5 mm into the top panel of the envelope.
Tighten the knob for the adjusted insertion edge.
Repeat steps 2 through 4 for the other two insertion edges.
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