For changing the Volume of a pinball you always have to open the coindoor.
And mostly you have the key in the coindoor.
I find a solution to move the switches outsite of the coindoor.
So you can remove the key and it looks better.
I connected the volume + and volume – parallel to the switches inside of the coindoor.
But they don’t work without opening the door.
So I have to put a „coin-open“ switch outsite too. Its the green one.
To change the volume you have to press the green once and then you can change the volume via the two red and black switches as usual.

Here the first pics

Video:

you have only to replace the original red plastic with two screws

remove the lamp

,

put in the new one with the wires

connect the three crocodiles to the inside switches

here you can see the replaced coindoor plastic with the new one

Here you can see my little treasure Project. It will be realized in a pin like Tales of Arabian Night.

I have put some RGB changing Leds into the chest and some holes into the treasure area.

And I have put some glasfibre into the holes to make the effect more viewable…

Look here some pics and a video

Video: