Sadly the material is no longer available
Clive had the same problem with one and he took his to a local chain and it seems to have stayed on since
The other one came loose and he used Evostick on it and that seems to have stayed put
So maybe you just got a bad shoe repairers I know the wife used one and the heels came off so she changed
Simpsons seem to be quite good
Other alternative is you could drill 4 holes in each hoof and fit Mk3 hoofies
Most hoofs will fit other stilts but you normaly need the bottom bracket too
Having said that the bolts on the bottom of the Skips are smaller than all the other stilts
Jason