i've got the same spider as on hoppy days site - didn't get it there, but seems fairly common around the traps
http://www.hoppydaysbrewingsupplies.com.au/product-category/accessories/
have found mine (around $35 from most sources) generally perhaps a bit micron too fine on pellets, and it tends to clog up on wheat brews.
i now see a coarser (and by the look of it, sturdier) spider on the gf site, spider from mangrove jack.
that one is $59nz. only found it last night and now looking around to see if i can get one in oz.
http://www.grainfather.co.nz/#!online-store/c8k/!/Accessories/c/10695014/offset=9&sort=nameAsc
thinking seriously to get one. i may use both - the coarser one for wheat and undecided on barley.