Never seen them before, but they are awesome. Definitely seems like an obvious place to cut cost for the manufacturer. From a collector standpoint, I would much rather have them. Pretty cool powdercoating opportunity as well.
In a related note, is this what Vid means when he says to put rails(wood or the nice metal) on un-populated playfields to prevent warping?
I have a 1967 Bally Surfers that has metal rails like that. In addition, the plated upper arch (the one the ball rides on) actually fits into a slot on one of the rails.
The inner rail on the ball shooter lane on the game is also metal, plated, and screws into the p/f from the top.
So not a new idea in the world of pinball.
They were used on CFTBL, BSD and White Water. What I was told is they were used on playfields that had a warp to them. While your set is NOS, many times on more used games, the holes strip out, and there's no good way to fix this - can't tap them out to a larger screw, because it'd scrape the inside of the cabinet.
I'd make a nice oak set for your BSD, if it were mine!
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