First of all I need to admit that I'm clueless with hydraulics! I want to use a small finger (or flail) mower/hedge trimmer on my TX2160 HST. The ones which run solely off pto are either too heavy or require too much power for my little Iseki, but the ones which run off tractor's hydraulis are much lighter. But there is only one spool valve on my tractor. Is there a way of adding a second spool valve to achieve this? (Please be nice and bear in mind my first sentence!)