Just an FYI on taps.
General purpose taps are usually carbon steel and are what you can pick up at most parts houses, sears, HF. For the most part these taps will work for low usage, chasing bad threads ect. 99% of the time these will work for what most of us use/do in our garages.
If you where to need to tap multiple new holes the better choice would be HSS (High Speed Steel). Little more costly but most likely they will last a long time. Or you could just purchase the single tap needed not a full set.
Looking at our suppliers cost for tap sets, the HSS is roughly 3X the cost of carbon steel.
Link:
http://www.basstool.com/2014catalog/basscat.html#456