Make sure the ball is going from the metal box to the switch of the coil

Go into sw test

Drop a ball manually in to the thing box see if the sw for the coil works

Look where the thing box mates with the subway, this may need tweaking. If the game was shopped before you bought it the two weldments by the swamp can be assembled wrong, if they are the ball will hang on the lip.

This is the problem,Check that switch

+2 --> If it's not the switch (because it does pop it back out sometimes) the alignment will make it act all funky and inconsistent.

It's a bitch because (at least for me) when the playfield is inverted, in the service position, it's hard to visualize the path that gravity must pull the ball, to get it to the vuk. Trial & error, my friend.

we have this pin at my work and the operator was going mental due to this exact problem haha he would think its fixed then leave and get a phone call about a stuck ball on TAF within hours. its all good now but cant remember how he fixed it. my bet would be the switch though

Raise the back leg levelers...
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball.htm
http://www.PinWiki.com - The new place for pinball repair info

If there is a divot worn into the metal box from the ball dropping it will need to be pounded flat.

LTG

I know this is old but I had the same problem and it wasn't solved by any of the answers. Turns out my box that thing lives in and leads to the ball return was slightly loose causing the opening to not be exactly square with the return chute. I had to repair a screw hole and used Gorilla tape to tie the box to the chute support. No more stuck balls!

Tape