As with all my temporary jobs, no doubt these will be "permanently"
temporary.
  Actually, in terms of geologic time, all our work is temporary, init?
 I've got an old metal roofing square that actually disassembles for flat
toolbox storage.  A couple of tiny dog point set screws firmly hold the
parts together as I recall.  Haven't seen it in a long time so I'm not sure
where I put it, but if I find it I'll post a few pictures.
  I think it was made in the 1940's or thereabouts.  Anyone else have one
of these?
Cheers from Waterloo
Claudio