[Adger Smith]

Quote: OK, i got a lot of advice about using spirolocks as opposed to me wanting to use Tru-Arcs. so i will use one spirolock and one Tru-Arc on each end.

Ok, since you digested all the info, tell us which lock will you put on the outside? Oh! I bet you are going to stagger them from piston to piston.
Why not just put the tru arcs on one end of the pen and the spiral locks on the other end? That way you could be a test bed and run them until one side or the other fails...