Just use pliers and bend it very slightly. Much easier to do if you take the assembly apart
Just got back to thus repair this morning. I followed your advice and disassembled the smoke unit to get to that "arm". It was easier to bend but unfortunately my chuffing woes continue. At first I continued to get intermittent chuffing both forward and reverse but I'm beginning to think the problem may reside with the on/off chuff switch because I turned it off and the unit continued intermittently chuffing. After a while it stopped. I then turned the switch back to the on position and received no chuffing whatsoever in either forward and reverse. So, currently the chuffing is totally non-functional. All other sounds work beautifully and the engine smokes up a storm. At something of a loss here because I'm leary of getting into the wiring for the on/off switch. I've checked visually and can't see any breaks or worn wires. Anyone else have any additional guidance. Help would be appreciated because I would like to get the chuffing sound back.