@bimmer050 posted:..I have inserted a layer or two of plastic electrical tape to weaken the magnetic attraction from the solenoid but that hasn't worked reliably...
Try one square of making tape.
@Choo Choo Charlie posted:A reel to reel tape recorder head demagnetizer might work but who beside me would have one?
I have two. However, it should work as well or better just energizing the coil with AC whenever the whistle isn't being activated.