I have a PCB that I am looking to do selective soldering. I am looking at several systems (IE Seho, Pillarhouse, Premier Tool Works, wave pallets). The board is mixed SMT/PTH, but only has SMT on topside. It has 4 PTH(2 leads ea)components (.030 lead diameter). I am looking to define an expected DPM guarantee from the equipment suppliers. I beleive that 20 DPB is a reasonable level?? Does anyone have any feedback?