Quoted from JackOfPots:Can you give me more information on this and how you fixed it? Maybe a picture of what you did ? I have those exact two issues. Left orbit sending the ball into the left sling (I've fixed this) and the ball not being held properly when a haunt starts.
There really isn't too much more I can show or describe. It was a pretty straightforward job. When I looked at the post that holds the ball behind the backboard I saw it was very close to the opto bracket that's right by the post and thought that could be causing the resistance I was feeling when I used my finger to pull the post up several times in a row quickly. But then as I looked closer it seemed like the post was more against the edge of the hole on the side closest to the backboard, so I decided to try using washers behind the coil bracket to move everything away from the backboard and more toward the center of the hole.
In the picture in my post I circled both screws. You can see part of the washer behind the bracket and the top screw. I took one screw out and used a magnet to slide a washer in behind the bracket while I replaced the screw. Then I repeated that for the other screw. By doing one screw at a time I didn't have to deal with the coil dangling from having both screws out.
I'm sure there could be different reasons for balls not being held in the house. This was what was going on with mine and it's made a big difference in how frequently the ball is held for me so I thought I'd share the info. It's definitely worth checking first both visually to see if the post seems to be up against an edge and by feeling how the post moves before doing it though, because it could be some other reason the ball is coming out of the house on yours. At worst though it's a pretty quick job to add the washers to see if it helps.
And, again, the sound on mine was a bit of a giveaway also. I'm now hearing a much more consistent thunk sound from the post when I'm playing and a ball gets held in the house. Hope this helps on yours.