cut a 10mm square inside cushcore. fit cushcore, lining up 10mm cut out with valve. Drop wheel W cc into tyre "iv fitted into magic mary's DHR DHF's" work the tyre over the CC, use soapy water if struggling, Place onto side, onto something round, i use motorbike tyres, used a endurance tyre mouse last off. Then grip tyre & CC with both hands, push away, pull back in getting the tyre inbetween cc and rip, repeat all round making sure tyre pushed well in, Turn over & repeat, 20 min jub start to finishI'd have liked you to have been present when I was fitting my Tannus inserts then! I suspect either your tyres are a bit looser than mine were, or you were really levering it on... Though I'd be interested to see how you stopped the tyre coming back off on one side whilst you lever in the other.