I'm installing new tuning keys onto my Aria Pro II Precision bass. Ther reason I'm replacing them is because the existing ones are hard to turn, and on the G key, the elephant ear thingy (don't know what its called) fell off. On the ones I purchased, the screw mounts are slightly larger than the ones on there already. Would it affect the bass at all if I screw the screws into new holes slightly farther apart than the holes already there? Also, is there any guage I can use to get them straight. One of the holes matches up, but it might be at an angle, I'm not sure. In addition, should I use the existing bush mountings or the ones that came with the new keys, if so, how do I remove the old ones? Thanks.