One of the champions produces a Sar coin, somewhat begrudgingly ('you can get 24 glasses of frothing Thunderfoot beer with one of these babies!').
"Wait!" shouted Halk, "I know a trick with these coin slots", and produced a dirty old 100 Spanish peseta coin. "It has the same weight and size as a Sar coin, and I always ended up with a pocketful of the buggers when returning from 'la costa' on me hols." Dubious looks were returned, but it was true. The bottom of the champion's cupboards were full of now devalued and defunct Lira, Francs, Pesetas and even that stinky Pound.
Halk inserted the coin. "It'll never work", murmoured Chani. The sound of a chink as the coin hit more coins, and then, curiously, it must have displaced more coins as the sound of a wonderful tinkling of small pieces of metal falling and rolling could be heard. Coins rolled our from under the door.
"Yes!" shouted Halk, "Bugger" said Alex - the first to notice the dodgy denominations of all of the coins. "Someone's tried that one before."
The Sar coin was shoved in the slot and the door duly rolled up.