Reportedly, the last production machines of this model, in late 1967, had plastic flipper bats instead of the metal flippers used since 1962. A page in the Instruction Manual explains an "Extra Ball Relay Assembly" that was available to operators upon request. This assembly would change the mode of the game from Replay to Extra Ball, awarding one extra ball per ball in play instead of awarding replays. The relay would be mounted on the lower cabinet board in a vacant space provided for it. It plugs into a nearby 8-pin jack. If this relay was not installed, a shorting plug was necessary in that jack to provide for replay operation. The schematic diagram makes dotted-line reference to an "Extra Ball Relay" at locations 10-F and 20-G. We did not find obvious reference to it in the Williams 1969 or 1971-72 Parts Catalogs. If anyone has pictures of this relay installed in a Shangri-La, please contact us. If anyone has an Instruction Manual for this game, please contact us. See Williams' 1970 'Gay 90's' for a picture of the Extra Ball Relay for that game.