I am starting a radial 9 cox engine proyect. I foudn an online shop with all the piston and heads I needed, and agreed with the seller, he will specially order some
17/32-40 thread taps to sell on his web site at a "decent" price of $55. Keeping in mind that I have received quotations of $200 euros, $50 is a good one. Hope this opportunity of getting cheaper taps can make others start new cox proyects.
http://www.exmodelengines.com/cox-.0...-head-tap.html