Hello
I just bought my first blank to build, and I have an old rod building book that told me to find the spine of the blank and mark it.
I did as the book showed and slowly rolled the blank in my hand while one end was on the floor.

My question does the "spine" bend in two directions or just one.

Second once I find the "Spine" for a casting rod the guides should go on the opposite of the bend correct?

the spine, or bend shows me the way the rod would bend when fishing so, I deduced that, am I correct?

I picked up an old fly rod that only has the tip top guide on. I rolled it and found the tip top was turned 180 out from the bend or "spine"