Automatic transmission or manual/stick shift?

I only have knowledge of the automatic OD, but if you had a working system before your o-ring replacement and now do not, you may have knocked dirt down into the tiny holes which pass fluid and allow the OD to engage. Or, your o-rings could have slipped during installation and now are blocking the ports, or letting fluid squirt out (check for this).

Your comment about refurbishing the solenoid however makes me think you have a manual, because I have no idea in what way the average home mechanic would refurbish the automatic OD solenoid.