Quote Originally Posted by Brother Jeeter View Post
The board should be something like a piece of pine shelving, smooth, flat and larger than the strop. On top of the board, put a couple of bricks, some books, or some other objects that have enough weight to flatten the strop. Leave it like this overnight.
Not from personal experience of course...

But also a nice wide straight ruler as long or longer will work. Placing the strop on a flat table (not your wifes table she inherited from her Grand Mother) like a glass or marble top to avoid staining.
Flatten it down (you might have to reshape it a bit side to side to get it aligned again) and put the ruler (or really smooth board) on top. I'm not with putting too much weight on it [books, bricks], those could leave some imprinting on the leather when dried with the board or ruler.
I've got these little marble coasters for drinks that put a very light, but firm pressure just enough to keep the strop from curling up while it's drying (that is what we're shooting for here). I'm not sure if I would use any oil on it until it's throughly dried (like Lynn said). You don't want to trap moisture in the leather. That could cause it to rot out (see eBay for example photos... ).