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Originally Posted by zonie77  B b o b said he would drill out the holes without the guideplate. This was after doing a couple. I think that if you are careful you could do that. I would't advise it the first time or if you aren't the careful type but the old hole does guide the bit. You have a bit of play around the bolts anyway. If you don't mess with the guide plate and have a couple of drills it would be a lot faster. We took a whole evening to do it so more like 3-4 hours. |
I am not sure why you would need a guide plate at all. There is no question that the drill will follow the old hole. The important part is making sure the tap goes in straight. I would also make sure the drill you are using is ground for aluminum and maybe blunt the chisel point of the drill so it would be impossible to go deeper than the hole already there. The problem with enlarging a hole already there is that the drill may grab and pull itself in. Drilling aluminum is especially prone to do this.