i bought the nuts and bolts from mother pluckin bird toys (
Mother Pluckin' Bird Toys - Home of the ATOM) and i think those medium sized whiffle balls came from california bird nerds (they said theyre large but they are NOT lol)
the end pieces of the bolts pop off and you just screw em into the holes
dummy proof really :) lol
i bought a couple big bolts for chickie baby and she managed to twist the nut tight onto her toe while she was holding the bolt...she was not happy and hasnt touched them since
the big ones are really big
but the ones in the ball are small enough that chickie baby can tear them up so its only for the smaller birds
boogie and wasabi climb all over it yet i havent seen them twist any of the nuts yet