I have a Street Fighter II machine in the garage that is 100% working. I'll see what I can find out.

You can find alot of the switches here (including the 29104U)

http://www.pbresource.com/pfswitch.htm

Yea that PB resource is most surely the goto place for gottlieb parts.

If the ball drains before 45 seconds (or what's set) I get a DMD message with a shoot again message. It's quite possible the trough switch is set too close and intermittently connecting making it think the ball drained. This is a four ball system so that would be the trouble you are experiencing. The ball is actually still in play but yet it thinks it drained and launches another one.

I wouldn't try to substitute switches as long as the originals can still be purchased. You're just asking for hassles you don't need. Spend the extra couple dollars to get the original replacement part.

Do you have the original manual for the game ? I'm assuming you do since you know switch numbers etc. If not I can scan my manual and email it to you.

It's a really fun game and I hope to get it inside soon. I paid Wolfman a whole $400 for it and all it needed was some lamps.

"How many Balls do I have to break !" hehehe (attract message from game)

Does StreetFighter uses opto's for the ball through? If thats the case check for cold solderjoints.

Sorry but I've never had the need to open it up much and look. It's my only DMD. I guess I was lucky to get one in such great shape for so little money. All of my other machines are the 70's - 80's tech. Call me old school .. most of my machines are like me .. aged and lucky to be putting the balls in play