OK, basic question for any a youse what work on hydraulics...
I know you can use a double acting cylinder with a single
acting valve by putting a breather in the unused port. But can
you run a single acting cylinder from a dual action spool by
plugging the other port? Would you need to add an extra relief
return before the valve for a standard dual action open center
valve, or would the OC or the valve internal relief take care
of that for you?

Working on a small project, and trying to minimize expense by
designing to what I can scrounge...

Thanks,
--Glenn Lyford