On 06/03/2019 19:39, Rob Morley wrote:
On Wed, 06 Mar 2019 18:46:07 +0000
(Alan J. Wylie) wrote:

I found this sliding patio door lock fitted on the house I've just
bought.

https://rfvt.org.uk/tmp/apprentice.jpg

I wonder if it would otherwise be possible to lift the door out of its
track (and off a normally positioned bolt).

The more usual approach is to fit blocks into the upper track, so that
there is only room for it to be lifted out when fully open.

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Colin Bignell