Why does the #2 master pin fall out of a cylinder?
A #2 masterpin can fall out when the key used to operate a cross-keyed cylinder is partially inserted or partially removed prior to completing the key rotation. This issue is typically seen in a cross-keyed cylinder with a stack of #2 masterpins in the last chamber. Since multiple chambers are empty and usually with 2 chambers have masterpins a partially inserted (or removed) key can create a shear line allowing the key to rotate. Depending on the key used a #2 masterpin can be pushed into the "bible" and with a partially inserted or removed key the end of the key can't keep the #2 masterpin in the bible thus it falls out.
- Fill empty chambers to reduce the chance of creating an unwanted shear line
- Review masterkey system and pin chamber 5 instead of 6 if possible along with another chamber
- Redesign of the system to eliminate the #2 masterpins in the last chamber, try to use solid pins
- Utilize Primus as a partially inserted key will not rotate
- Utilize electronic access on the opening where a cross-keyed cylinder is installed
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