(The origin of this expression could be found on New Zealand sheep and dairy farms when farmers used to build and repair their own fences using No 8 gauge wire. They had so much of this wire they used it to fix almost anything. Cars, tractors, haybailers, etc. - anything that still worked was often held together with this No 8 wire.
Now days everything in NZ is measured in the metric SI system - the same wire measures at 3.26 mm! Who's going to say "use some 3.26....", however the expression has stuck with the older generations in New Zealand).
When I get stuck on a problem I always say to use a bit of No 8 wire.