Good point with the brand of Hammer! I've had it happen. There can be quite a difference between the types of Hammer too!
Does anyone use an "Electrician's Hammer"? I've got one that's never been used.
Sparky,
I once saw an adjustable 'Thingamabob' where you set the height and just laid the box on top and nailed it on. I saw it at one of the suppliers and thought it looked interesting, they never stocked it though. Your 'stick of wood' idea is cheaper. That's a keeper!