could not fully understand what the guitar mod guy was trying to explain to me on the phone,so here i am seeking help. i enquired about whether the op3 can fit onto the cavity of the olp. nope,the guy said,the cavity's too small,any modifications to the cavity can result in serious disfiguration of the guitar. next i asked if 3 knobs would be sufficient for the treble ,mid, bass and volume controls. no again was his response.4 are required he claimed.1 for volume and another 3 for the treble,mid and bass. I then curiously asked about the possiblity of using a push pull knob to make up for the lack of one extra knob.nope,not enough he said.I did the maths and what he said does not make sense. can someone help me? my guitar isn't an olp,its a stingray clone that has only two knobs.I could drill one more knob in,if 3 knobs are enough. plus,because my bass has no cavity at the back,unlike the small one that olp is already 'condemned' with,does this mean that there is a lot of potential for modding.can anyone advise?