"Steve Walker" wrote in message
...
Greetings -

Because our cat won't take no for an answer, we need to reinforce the
catflap against escape. The simplest solution is a slide in 'guillotine'
panel which covers the whole assembly (insert jokes about sharpened edge,
baited with tuna etc).

I have various types of stout thin board, that's not a problem. But I
need some J-Channel to slide it in and out of. Something like 10-20mm
wide at the back, and 5-10mm wide at the front, and able to accept a 3-4mm
board sliding in. Two lengths of 250mm would be adequate, sturdy plastic
or aluminium would be ideal.

I've seen similar stuff on the back of self assembly furniture, to hold
the hardboard back on. Common-sense says there's probably some way to
scavenge or convert it - cut-down electrical trunking, alloy channel for
fixing greehouse glass or summink?

Ideas very welcome...!

My neighbour's cat has three homes, it's own, mine and another neighbour -
depending on what mood it is in and what you feed it. It has a collar with
a magnet so when it goes near the catflap it will open to allow it in to
next door's house. Once inside it can't get out unless the catflap is
switched to allow this. The catflap can be set for incoming, outgoing or
both. It usually sits at the back or front door here and will come in if
the door is open. If it's cold out it will sit on the window ledge ! For
your catflap you need to glue some very small trunking around the edge
inside. Then slide a piece of plastic or wood down in to it. Arrange it
like a squared U shape. Don't forget the litter tray by the door as the cat
might have a reason for going out.
I wouldn't bother about it staying out, they all come home when they're
hungry or cold, cats are very intelligent. Far brighter than dogs.