Good after noon Respected Sir, yes sure ..and i know, yes by this short time i have rectified many doubts and technical probs,by asking to the veterans, in MBMH, and so happy for the correct guidance from all. its a grace indeed. but now i am willing to thank that person , because that book helped me a lots.my first puffer was based on his book, as Para handy, and that book was a great asset till to this date. and i was wandering all over the nations because of my research in aeronautics, but even though i couldn't find that respected person.so by this time i have mailed twice and drafted a letter to the given address.waiting hopefully.thank you.and good night.