Hi I am trying to extend my string on my top dump valve on my OMS single bladder wing. problem is when I unscrew the dump valve the hole lot comes off including the bit that should stay fixed to the wing. I have soaked it in hot water but still no joy. Is there an easy way to get them apart. I have thought about putting some grips on it but it may chew the sides up a bit. Has anybody had the same problems I think it has been overtightend at some time.