yeah kent is the only source in the US for the monark nozzles; sometimes you can find them on ebay from a private seller. if you got the pressure shims for your injectors then yeah i'd go ahead and disassemble them and pop test them. i use acetone to clean mine (just soak em, the acetone will take any gunk off), just don't let the parts dry or you will get surface rust real quick. i usually take mine straight out of the acetone bath in dip em in clean diesel.