Rocks line the bottom of #9 to hold the roofing paper in place. Searching for the proper position for the PVC anchor relative to other posts and a forthcoming joist.

A lot of joists will be feeding in from various directions, so need to get it right.

That piece of plywood is trying to hold the flap closed.

Rocks in the bottom of #10 also.

Using aluminum sheeting to form this column.

With everything pre-wet, poured the concrete, inserted the anchor and hoped I got it right.

I did not use an anchor here primarily because I could not determine exactly where the Post will be, but posts 9 and 11 will hold this end of the deck down.

The hole in the bottom of post #9 had to be bored off center to position the post correctly.

These 2 images show why it matters. Post #9 will support this end of a long joist which must be straight so that the edge of the

long decking board on the right will pass right down the center of the joist and so that the boards butting against it will also rest firmly on the same joist.

Finally found out where post #10 will be. Notice that it did not end up centered on the concrete, meaning a centered anchor would have ended up completely outside of the post (well, kind of like #11 did).

Had I placed an anchor near the edge of the #10 concrete instead, that segment of the concrete column might one day break off under pressure.