I have seen an ad on TV by Butch Harmon for a regulatioin size driver that has a weighted head. I am trying to get back to swinging through the ball and I think that with that type of club I could develop some muscle memory to help me follow through. Trouble is I am cheap, so If I picked up an old used club, drilled a hole in the top of the driver head and filled it with some substance to add weight would that do? Or is there something else I need to consider like the placement of the extra weight?