I have a Data East Star Trek 25th anniversary and the VUK out of the scanner hole is consistently weak. It usually takes 4-5 tries to get it out of the hole, each time resulting in a scanner award which is undeserved. Additionally when in multiball and there are a few balls down there it will almost never kick a ball up.
I've replaced the coil, and the coil sleeve then recently I replaced the entire core+plastic/spring upspring assembly. Any ideas on how to improve this would be greatly appreciated!