IPVMU Certified | 05/08/13 10:36pm
For reference, here is the type of strike I was mentioning:
I do not necessarily agree with the advice of that locksmith. If a door has previously been specified to have a mortise type lockset, it generally has been deemed as at least a 'security sensitive' opening. Mortise locksets are typically costly, and they are not the 'default door prep' for light-duty openings. In contrast, cylindrical locksets can be purchased quite inexpensively and typically are used on less vulnerable doors.
Fundamentally, having a separate deadbolt and latch is seen as a 'higher security' solution (ie: two points of securing the door, vs a single point) In this way, mortise locksets are 'more secure' than cylindrical locksets.
In most cases, pulling a mortise set and swapping it out with a cylindrical leverset can be considered a 'step down' in hardware. Granted, this is pure opinion on my part, but I think many door hardware types hold the same opinion. While a mortise-prepped door can be adapted for a cylindrical lock quite easily, it still may require a variety of door wrap plates and strike blanks like you mention.
The locksmith you spoke with may have been able to use a less expensive strike, but he ultimately recommended you buy/sell new hardware, strike blanks, and more labor time installing everything than if attempting to use the mortise lock already in place.
IPVMU Certified | 05/09/13 01:01am
Incidentally, the 'double strike' shown above is used for seperate bored cylindrical locks and deadbolts, not mortise locks.
I listened to the playback of the class, and I made it sound like double strikes are required for mortise locks. This is not the case. Typically for mortise hardware, a 'single' strike with a large pivot 'keeper' or jaw width is used. See examples below:
IPVMU Certified | 05/09/13 01:32am
Excellent, thank you for clarifying.
You must also include the "hold open" option for the keepers of deadbolts if you wish not to use a key to retract them. The hold open feature holds the keeper open until the deadbolt hits the close feature upon door closure.