I've got a couple of examples done this morning.
The first one is a passthrough adapter suitable for a CPS2 kickharness:
I also added a 5v voltmeter to it as requested. Price for these would be £15 for just the adapter or £20 with the added voltmeter.
The other adapter I did has a 5ft kick harness and 2.8mm terminals. The buyer requested some wires adding for a coin input which is the yellow/white loom.
The price for one of these with just the 5ft kick harness would be £17. If required I could add a voltmeter for £5.
Voltmeter passthoughs are available on their own for £12
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I agree it might be a good idea for someone to test some of the six button games out before I make a load more of these, I wouldn't want you guys to waste your money.