Hmm I would go into switch test and look for the keep it simple stupid rule. Kiss first.

Open your switch test, then while under your playfield make the snakes (Jaw) move forward and back ( As if it would do when hit by a ball) and see if it triggers the switch (On and Off) If not, then adjust.

Then move the Jaw to open and then close and make sure the switch opens and closes again.
(adjust if need be.

Also you will see there is a screw with a nut tightened to the coil housing frame, make sure that when the snakes mouth is open that there is only approx 1mm or just under of a lip holding it open, so the coil can easily pull the latch in ( otherwise you may need to adjust the screw also)

Hope this helps

Looks to be just adjustments mate.

Hi
Adjust B screw, loosen the one closest to the bracket and use the 2 nuts that are locked together to move in I think from memory, Just use your fingers to turn clockwise or counter clockwise.

Where your showing the circled lip overhang, correct - make that so it shows only about 1mm.

If you go to shallow, the snake will play up also.
test each time while machine is on and playfield is up.
Only takes a minute or 5 at tops..

No adjustment screw to raise or lower the snake other than washers.

I used 6 slingshot plastic washers, seemed the right size for me. (close to 1mm thick)
lowered the snake to how I liked it.

P.s Like to use the plastic slingshot washers because there isn't a way they can short anything electrical.

Hahaha you will be fine.
That's pinball for ya

P.s Mine is sitting approx where I have the blue lines edited.207644-i.jpg

You can get them from here.

http://www.rtbb.com.au/catalog/index.php?cPath=43_65&osCsid=3fad948c5a70e6ca931da85ffb5c1ac9

Otherwise go to Bunnings with your screw and get washers to fit, You just have to make up 1mm in height.

Bunnings might have plastic washers also?

np's - Have you got it working yet?

Hahaha Good to hear that you've got it sorted out.

I always replace those ugly metal Slingshot washers that stern supplies with those plastic one.
Looks so much cleaner in clear.

Are you sure that you have not adjusted the coil strengths in adjustments?
Seem's a little weird, as you can only move the snake mech maybe about a mm or 2 at tops while t he screws are loose.
I guess you tried that? loosen all screws and try twisting the eject lip towards the middle of your left flipper?
That's all I can think of - Sorry