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landcare research do a really good PDF on trapping and its comprehensive including care and setting up of traps how to adjust the plate etc google it

yes that was called sleeve skinning - some skins were dryed on a bent no 8 wire with a U shape -fur side out - we used to skin quite differently and tack out on nailed boards - got a more square...

you are right a trap cameoed on a run would catch even the real crafty buggers - few leaves over trap and bang - but it does hit kiwi if around

those traps should be fine - check trapping rules on DOC land certainly up here no ground trapping is allowed at all - all sets must be raised to avoid kiwi - but if thats not a rule then ground set...