#5 X 1-1/4" Switch Stack Screw
Ships from US and is sold by Pinball Life$0.15
#5 X 1-1/4" long switch stack screw used to attach EOS and lane change switches to flipper assembly bases. Often used in tandem with split lock washer #4701-00023-00.
Williams/Bally reference #4105-01019-20.