I am cutting some 2x4, 2x6 and 2x10 boards to put in our flash board system. I need to know what to add to be able to hook a T bar or crow bar to them to place them in it and remove them. any ideas?
I'm not familiar with flash board installs, but could you drill a shallow blind hole (or two) in the boards that would allow a piece of all-thread to be screwed into it, install it, and then unscrew the all-thread hence removing your installation tool? Just bouncing the idea off of you. If you needed it to be long lasting for future removal, maybe a stainless steel nut like this from McMasterCarr...
For our "boxes" or flashboard risers we use 2x6 tongue and groove boards. We build our boxes with a channel for the boards to slide down. You simply drop them in. We fab a hook from rebar that is similar to a hay hook.
Our hook is hammered flat kind of like a flat head screwdriver. With the correct angle it has no issue pulling boards. It even works on our 150" long spillway boards.