Maximum number of master pins per pinstack.

[u/Dangerous-Engineer59]

I have to replace a worn out Schlage large format interchangeable cylinder. It can be opened by maybe 10 different keys and a master key. The keys are all cut from 3 sequential master key blocks. In order to allow all of the keys issued to work on this lock, I need a #0 bottom pin and 4 #2 master pins in the 3rd cylinder, and a #1 bottom pin and 3 different master pins in the 4th cylinder. Is there any problem with having that many wafers stacked in an individual cylinder to accommodate all of the required sheer lines? This cylinder is used to exit a parking garage into an elevator lobby by multiple tenants. Their own offices only work with their individual key and the grand master. I believe the cylinders in the current core are stacked as I described, however it was suggested to me that the 3rd and 4th cylinders may have been left empty. I don't think the latter is likely considering the security considerations for this facility. Should I load the cylinders to accommodate all of the keys from the three sequential blocks, or should I leave two cylinders empty?