We've just done our 4th lot too. The first we struggled with ear tags so we bought the slapper and like you were a bit too enthusiastic......next time we were kinder to them, only for the abattoir to say we didn't have to do them so long as breeder tags were still in. So this time we didn't do them, phew! Not had our meat back as yet. Three saddle backs, two for us, one for a neighbour.