... natutunan ko ke Rudy Discipulo dati...when you press the 12 th fret dapat sa 5 to 7th fret papasok ang isang credit card the strings must not touch the 5th and 7th fret...
I like my guitar neck to be straight, so I use this technique. You press on the first fret or place a capo, then press on the 12th or even the end fret. When you put a kinda thick paper or even a calling card it between the strings on the 7th fret, the paper must go through smoothly.
Better way of doing it is to use filler gauges. For Strats, .008 - .010. Gibsons, .004.
For string heights, use a micro ruler. Measure string height vis a vis the 12th fret. Measurement should be about 3/64 to 4 64 inches. I like mine to be 3/64. For pick up height, press last fret and measure gap between string and top of pick up. It should be 3/32 on treble side, 1/8 on bass side (e6 string).
You do not need to know the neck radius of your guitar to set it up properly (at least methinks).
Hope this helps. FWIW