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Finally making progress. Rig had no flame arrestors so got a pair today. Could not get acetelene to flow beyond a dribble. Took valve off torch and blew compressed air into inlet as blockage was between there and valve. Got it flowing good and was finally able to light torch and get desired flame. Welded cheap comma dolly on top of slapper to press up underneath. 4 seconds of heat along ridge and bulge came down(shrank?). Made metal template and fits much much better. Small ridge just below one removed. Thats next.