On Thu, 04 Sep 2003 22:08:44 +0100, Andy Dingley
wrote:

Couple of things I missed:

The 2 1/2" and 3" measurements are the depth of the case (not the
height). These are fairly standard,

The reason why there are two sizes is (mainly) to cope with glass
doors with narrow frames. This is why it's the case _depth_ that's
significant, not something sensible like the backset.

You _can_ find non-mortice automatic rimlocks to BS3621 (handy for
front doors), so don't be fobbed off by insurance companies insisting
that all BS3621 locks are mortices.

Get the Yale one, not the Chubb. I've had both, hated the Chubb.

The Chubb uses weird keys. They're near impossible to have cut
(usually just one place in a big city) and even then the failure rate
on copies is high - I used to take as many faulty ones back as I could
actually use.

Chubb is insecure. The bolt is flat ended and held on a "trigger"
bolt. When you close the door, the trigger releases the main bolt. Now
this is fine, and how it stops the deadlock bolt being retracted by
wrong-uns. However if you slam the door, or close it very slowly, the
bolt may fire when it's not correctly aligned with the frame. The bolt
_wedges_ the door closed, but pushing the door allows it to be pushed
open !

The plastic interior handle falls off. It's made of unglueium.