for the flat lamp sockets, usually if you bend the barbs a bit it helps...especially if you bend them so they both angled in or both out so you get a wedging affect. You go into the same holes, but you want the tips to bite into fresh wood below the surface.

probably the best lamp tool I've used is something like the CTA Tools 1012 ($13 or so)....kinda like pliers with rubber coated/cupped ends. The main advantages over the or-55 tool are: it's easier to clean off when the lamps are dusty/oily, it's faster to use, and it works for all the lamp sizes.

the or-55 works pretty well tho, especially if the lamps are clean.

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the flat sockets were A-1653-1. They disappeared from the bally parts books around 1980.

the usual issue is clearance ... most sockets won't work well because the stick up too far.

if you have to replace a flat socket and have no donor machine to scrounge from (or know someone with a bingo parts head), most people use E-120-176 ... they can be stapled down or use small screws. The lamp may poke out of the wood a little more with them tho.

if your socket is still ok or maybe a barb is broken off, the operator fix was either a screw to hold down the socket edge or staple the wires down as close to the socket as possible. If you have room around the socket, you can get creative strapping the socket down.