Question re drillings on Best cylinders

[escher7]

Some of the Best cylinders I acquired from a local locksmith have been drilled on the side. Coincidentally, these are the Best cylinders I can't pick. Any of the Best pros know why they would be drilled in that location?

[Riyame]

That is for the grub screw that holds the cylinder in place so it can't be simply unscrewed.

[quabillion]

to retain the core with a set screw possibly. is the hole threaded?

[jones]

to retain the core with a set screw possibly. is the hole threaded?

I have a couple of brand new cylinders that are drilled & threaded, like these. The drilled part isn't on the control lug side tho, so it isn't for removing the core. It doesn't look like it for retaining the cylinder either

[Riyame]

to retain the core with a set screw possibly. is the hole threaded?

I have a couple of brand new cylinders that are drilled & threaded, like these. The drilled part isn't on the control lug side tho, so it isn't for removing the core. It doesn't look like it for retaining the cylinder either

When you screw the mortise housing into the hardware there is a little screw that goes in that hole from the inside of the mortise housing. You tighten the screw and it bites into whatever hardware you installed it in. This prevents somebody from easily unscrewing it.

[jones]

The cut-out is the part the retaining screw goes into, if you look at the top picture you'll see an actual threaded screw hole going on a slight angle through the lock cyl.

[Riyame]

I know, I have a bunch of them.

Here is a brand new one with the screw that it comes with. If it isnt for holding the housing in then it is to help retain the core, both of which you said it is not for. On mine the hole is actually in a higher position.

You can see that the screw has a pointy tip on it and is slot headed.

[jones]

You must be right, I'm glad nobody has used this on any of my jobs yet

[mdc5150]

You must be right, I'm glad nobody has used this on any of my jobs yet

If you come across any of my cylinders you will have to deal with them. We use those screws especially on our proprietary keyways.

[Riyame]

You must be right, I'm glad nobody has used this on any of my jobs yet

If you come across any of my cylinders you will have to deal with them. We use those screws especially on our proprietary keyways.

So, are they to hold in the core, or to hold in the housing?

[escher7]

That is for the grub screw that holds the cylinder in place so it can't be simply unscrewed.

I am having trouble visualizing how it would keep the cylinder from turning since the set screw is basically counter-sunk into the side of the cylinder.
It is clear that this is not an after purchase mod though, since you show it on a new lock. I thought maybe the locksmith was drilling for some unknown purpose.

[Harvey]

escher7,

The concept is to take what is orignally a 'removable core' type cylinder and convert it into a fixed core. By installing the grub screw at time of cylinder housing installation (by a locksmith), they can ensure persons don't attempt to remove a core and replace it, or superstitiously decode the cylinder.

It's also a really good way to keep your cylinders installed, as mdc5150 mentioned.

[jeffmoss26]

I see those every so often. Like the others have said, it's an extra way to keep the cylinder in the mortise lock.

[escher7]

escher7,

The concept is to take what is orignally a 'removable core' type cylinder and convert it into a fixed core. By installing the grub screw at time of cylinder housing installation (by a locksmith), they can ensure persons don't attempt to remove a core and replace it, or superstitiously decode the cylinder.

It's also a really good way to keep your cylinders installed, as mdc5150 mentioned.

Yes, I understand that part; clearly the screw would protect the core, but since the screw is below the edge of the cylinder, it could not prevent the cylinder itself from being unscrewed.

[Riyame]

escher7,

The concept is to take what is orignally a 'removable core' type cylinder and convert it into a fixed core. By installing the grub screw at time of cylinder housing installation (by a locksmith), they can ensure persons don't attempt to remove a core and replace it, or superstitiously decode the cylinder.

It's also a really good way to keep your cylinders installed, as mdc5150 mentioned.

Yes, I understand that part; clearly the screw would protect the core, but since the screw is below the edge of the cylinder, it could not prevent the cylinder itself from being unscrewed.

If you read the other replies in the thread you will find that it is not for holding the cylinder in as I thought. The 2 V shaped cutouts on the sides of the cylinder are where screws hold it in place.