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“ Thumbturn does not extend bolt ”

Resolution: After installing a classroom deadbolt, there is potential for the thumbturn to project the bolt only, get stuck in one position, or move both directions but not move the bolt. These are caused fro...:

What would cause the Von Duprin 88 series exit device latchbolt not to extend and the crossbar to droop?

Resolution: The spring in the hinge case or end case assembly lifts the crossbar and both lever arms. If broken, the crossbar and lever arms will drop down. The weight of the crossbar and levers will automati...:

Installation instructions for the D251 thumbturn x thumbturn deadbolt.

Resolution: D251 Installation Instructions:

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“ Thumbturn does not extend bolt ”

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