Yo Fred,
It'll be awhile before it's finished since I have to wait until it's warm out before painting her plus I presently don't have the $$$ to get a radial.

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Folding wing mechanism (cont)

I just talked to my buddy Joe, who works on hydraulic cranes, and he thinks I probably have some air bubbles in the line.
He had me try moving the outer mechanism and I could move them and he said that indicates bubbles are probably in the cylinders.
I know my auto brakes don't work until I bleed them and get all the air out of the lines.
Another possibility is too small of lines to the cylinders: if needed, I can run 4mm lines and put a conversion festo connector just before the end of the cylinders and going to 8 volts wouldn't hurt.