On Thu, 28 Jun 2007 02:43:26 -0700, RobertL wrote:

i have a newish plastic front door with a Yale lock with
eurocylinder. it has an annoying feature but maybe there is a reason
for it. can aonyone explain please?

The eurocylinder has two cylinders for the key, one facing inside and
once facing outside. You can unlock the doo from either side, but it
latches simply by being closed.

the trsange featiure is this: If you leave a key in the inside
cylinder then this seems to prevent you fully inserting a key into the
outside cylinder. So, if you do leave the inner key in place then you
can lock yourself out even though you have a key.

Is there a reason for this feature?

Robert

Probably so that you can lock the door from the inside and be sure that
no-one can open it from the outside - rather like using a separate bolt.

You can buy replacement cylinders that allow operation from both sides
though.

SteveW