I know this is a pretty dumb question but what is the correct slingshot rubber size for a 80's/90's Bally/Williams era game? I had always thought it was 2-1/2" but while recently looking to get a set for Funhouse several vendors (Titan, PinballCenter, etc) don't include sizes any bigger than 2" in their game-specific kits? Is this correct and/or was Funhouse different than other B/W games?
And if you don't have a manual...
From http://user.xmission.com/~daina/tips/pub/tip0117.html:
Ordering new rubber rings using old rings as a guide is sometimes impossible due to broken, non-elastic, or missing rings. The following chart will help you determine the correct sizes for all your rings. Measure the circumference around the posts. Find that size along the left side and note where that size intersects the red line. Follow that point down. That is the size of your new rubber ring that will fit. These numbers are the inside diameter of new rubber rings, which is how sizes are denoted. Note that small sizes smaller than 1" may be difficult to determine on the chart, but are easy once you know the rules.
Mini-posts with pointy tops take either 27/64" (common) or 23/64". The rare smaller size is for those places where the normal size is too large.
Mini-posts with a short flat top takes either a white or black Gottlieb #962 style T-rubber.
Most single playfield posts take 5/16", but will take the slightly larger 3/8" rubber. Be aware that in some places the 3/8" rubber will not leave enough clearance--it is larger. Some people prefer 3/8" everywhere because it gives a little more bounce.
Narrow cylinder-style single playfield posts take 3/16".
Bally mushroom bumpers take 7/16". Be sure to change these as they are often overlooked when changing rubber because they are not seen, hiding under the "mushroom".
Two normal playfield posts nearly touching will take 3/4".
2" flippers will take one or two 1" each, or some prefer 1-1/4"
3" flippers by all but Gottlieb take 1/2" x 1-1/2" flipper rubbers, but can take 3/8" x 1-1/2"
3" Gottlieb flippers can take 1/2", but have a better fit with the 3/8" x 1-1/2" flipper rubbers
Don't forget to get a new plunger tip and rebound rubber (the thick black/brown rubber disk that the ball first hits on most playfields).
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