Quoted from dnaman:Folks, what has been some of the ways to fix the release of balls from the munchkin lock?
I think that I have tried everything.
IE: bending the small resting tab underneath the lock bar which holds the balls back (the lock bar which raises and lowers with the coil). I have bent this down and up, both in varying amounts. Basically resulting in the arm letting the first ball through and the arm sitting on top, or slightly top front of the next ball, or letting them through. Note: if I bend the tab to allow the arm to almost sit on the plastic subway then the first ball seems to cup into the backside of the face of the arm and the coil won't pull up the arm. I have put tape across this opening to see if the position of the arm solves the release of multi-balls but it does not.
There is a coil setting for the release timing of balls 1,2 and 3 when locked and releasing them for multiball. I don't believe that has anything to do with what I need. That would just allow you to wait between releasing the balls.
I think that the pitch of the pin is ok. Not sure what else to try. This makes it bad (unfair) for a multi-player game of course.
In order to get the lock bar to work properly you first have to make sure its tightly mounted.
the tolerances are so close that loose screws really affect it.
Under the hut plastic the the top screw on top of the ball lock solenoid assembly is generally not tight.
You might notice this because the lock bar can move side to side in the ramp when it should be firmly mounted.
Tighten the big silver single screw and put blue loctite on it.
Secondly the 2 screws on the bottom of the ball lock coil assembly are always loose.
These are harder to get to as you have to remove the ball lock assembly from the ramp. Its not hard just tediuous.
After you made sure the assembly is firmly mounted, you can proceed with adjustment.
Adjustment is pretty straightforward.
Make sure when the lock bar is raised that it clears the balls by a good margin like 1/4"
When the bar is at rest, the lower front end downward loop has to go about 3/64" past the side apex curve of the ball.
It has to touch the ball just below the centerline.
If its higher, balls will push thru. When its slightly below the center line the balls will try to climb the loop and be trapped.
Measured from the ramp inside bottom the the edge of the loop is approx 12-13mm on my game.
After a few games if balls escape, bend the lock bar down only 1/32", or half a mm at a time until the balls try to climb the loop instead of pushing through.
If the lock bar drags on the balls you have to adjust the solenoid bracket or adjustment tab by bending it open more, until its higher and start over.
Because the sweet spot is only a millimeter or so, its important the the mounting screws are tight to begin with.
It took me 2 years to figure this out.
Properly adjusted and timed the arm will not drag on a ball and a high speed ball will not raise the arm at all if it hits the end. The curve of the ball and its rolling motion should force the arm down under the ball not up.
So, again, start with making sure the ball lock assembly is firmly mounted to the ramp before you adjust anything.
Often its just loose and needs no adjustment at all.