I bought a Quantaray QSX-DigiPro 8500 tripod but did not use it for a couple of months. When I went to do so, I found it came with no manual and the uppermost turnscrew is missing. The store will not help me. Can you point me to a source for the manual and, even more importantly, information on where I can buy the missing part? Thank you. RJIS@Remington-Farms.info