Ok. then I solved the problem my self
I did use a carpet knife,and cut around the foot,so making room for the foot to come longer inn,thus making the heelstrap "longer"
Cut carefully 3mm each time,until it fits. +I use soap to make the foot slide into place.
No all I have to do is repeat this in the sea with 1-5 C in the water,and 5 to -5 in the air... brr
I think the temperature will make it harder to flex... so maby I will not get it on.. ah well we'l see
