Fix
O.k. I think I know the fix. It's a pain in the ass though. You would have to adjust the horizontal width to make the screen small enough where those lines would be on top of the high score. Now, the picture will be a lost smaller and as soon as you even try to increase the horizontal width those lines shift below the high score.
The fix:
Adjust the horizontal width until those lines are well above the high score. The picture will be a lot smaller and it won't fit the screen.
Next, you'll have to discharge the monitor and remove the chassis. This is a WG 4900 that I'm working with. C365 cap position is the Horiz width cap which will need to be changed to a
different value so it will expand the screen to hide those lines. The capacitor that will needs to be used is Polypropelyne (Bob Roberts sells these). The best method of testing which cap will work best with your chasssis / tube is as follows:
Make a double ended alligator clip wire. At position C365 you'll need to remove the cap at this position and solder in two posts so you could clip one alligator clip on each post. On the opposite end alligator clips you'll need to dry different size polypropelyne caps to see if the picture gets better or worse. Once you find the right cap and the screen expands properly, those lines should go away.
Here is a list of Horizontal width cap locations for different monitors from Bob Robert's page:
* Common Width Cap Positions
* Wells-Gardner K4600 Series - C615
* Wells-Gardner K4900 Series - C365
* Wells-Gardner K7000 Series - C38
* Electrohome G07 - C515
The Bob Roberts link for the horizontal width caps page is as follows:
http://arcadecontrols.com/BBBB/width.html
Now to test this method myself. However, I'm confident that it should work for all.