here is a part wanted by Crashramp for his Xenon & Kings of Steel - Roll Over Button - ASW-A1-162
Funny enough Crashramp seems to have the only machines that used this type of Button. There are 4 Roll Over Buttons at the top of the playfield, I was able to model accurately and then make a fairly close sample and like stated before I will get Shapeways to make one to confirm final accuracy before opening to the public.
Note: Shapeways charges a minimum of $20 for postage to Australia so best to save up and get a few things at a time. I will soon have about 10 items for Nino designed, tested and listed there from the SS 80's era, as well as various mods (band stuff etc), though I will still print some mod stuff here as it is often suspended and out of the road from impacts and I have some cool printing plastics coming soon - wood grain 
. I have investigated a number of other print services and though some are slightly cheaper, the material options are poor, so Shapeways is the happy medium.
Also Shapeways print quality is Nylon Plastic in flat or a little more for polished and makes the parts by laying 0.10mm layers of powder and then depositing a liquid component to finalise the process so the level of detail is very good doing 10 layers for every millimetre.
Think youll find that those buttons are quite prevalent in BALLY EM games.. HI DEAL is one that immediately comes to mind..
Quick IPDB search reveals that these can be used in the following games:
HI DEAL
XENON
KINGS OF STEEL
ROCKMAKERS
ODDS $ EVENS
MONTE CARLO
FLIP FLOP
FORE
