I've just got a second hand pair of Barker Creative goodyear welted shoes and I think they are going to kill me!  I went for a short walk to the shops and found myself slipping helplessly in them, it seems I'm slipping on the tacks in the heels. They are the the first shoes I've had with a 1/4 rubber heel and which have tacks holding the heel together. The sole appears to be the original one and I don't have any reason to suspect the heel isn't either.   My question...