what is lost ball construction cylinder

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With split key construction keying there are two ways the construction insert is retained in the cylinder so that it won't fall out the back end of the plug, see Figure 1.  The&nb...
The 09-900 mortise cylinder thumbturn has three handing options: right hand, left hand, and non-handed.  Handing of the cylinder is done by a check ball and spring placed in the housing a...
Also applies to the 09-900 XL12-196 mortise cylinder coin turn.