Hi David.
Not sure of just what you are looking for but I'll give it s shot

.
The prop 'should' already be at flat pitch with no oil pressure on it. If you're trying to rotate the blades to make your prop root cut outs in the spinner and behind the spinner......I use a couple of boards. I took a 1x4 and cut it to about 3' long. Then I took another piece about 1' long and screwed it to the end of the 1st piece with a couple 1" wood spacers between the 2 boards. I tape some plastic over the blades and wrap a towel over them. Then I take the wood 'tool' and slide it over one blade and just lever it around. I have two of these and use one board on each blade.
Basically, just make some kind of lever so you can turn the blade(s) without scratching anything....unless you don't care about scratches

. I've seen folks use a couple of those Craftsman strap type oil filter wrenches as well.