Have just taken posession of my "new" house.

It has a sliding patio door. The door is secured with a handle which
is pushed down, then at four positions on the door, bolts go into the
frame. A key is then turned in a lock which prevents the handle from
being lifted.

Pretty standard I would have thought.

I want to replace the lock. I believe the lock manufacturer is
something like Siflo (?)

Are these locks easy to replace or is it a specialist job for a
locksmith?

A friend is helping me replace the other locks tomorrow.

Advice, anecdotes and comment wanted.

Nozza
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