Grezzer dont take this to be a down side to all the help you have given to so many members in the past . I wish i was closer to you . I need to build my own pop tester .The cost of cleaning the old type fuel injectors for my m103 engine is like the price of 1/2 the cost of a new set of 6 . I have the seals to do the job but without cleaning the injectors i wont instal them . Good luck with what ever you think is best in the end. ..