[Jukebox-list] Another AMI F question

While the subject of AMI F's is on people's mind, I'll bring a question about mine up:

My F120 is free-played (credit counter always says there's some), has and it has become a bit persnickety about whether the selection buttons will register. Seems to be different depending upon the selection. Sometimes it takes a lot of selection button presses to get the finger to shift, sometimes only once.

The selenium rectifier has already been replaced with a silicon diode, so I'm pretty sure my voltage is good.

Is there anything that can be done to lengthen the time that the pulse is applied to the coil that pulls on the selection finger?

Thanks,

--> Steve