Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hi Thomas, ..as mentioned by Stroker, don't get the hex wrench  hot..i used a fine tooth flat file and filed all 6 sides of the 3/32" wrench in a Slight tapered wedge shape until the tip just fit into the grub screw. Then, after tapping wrench down for max seating & applying hard downward force, Slowly turn that sucker counter-wise & you should feel it break lose without slipping or rounding anything off. Good luck with your process, tom