In the UK, during the late 1990s some coin-operated slot machines would accept two 1-schilling coins glued together as if they were a £1 coin. The two original coins had a net value of under 10p at the then-current exchange rate. Coin detectors were soon reprogrammed to detect and reject the Austrian Schilling. Not long after it was possible to buy on the Internet a bag of 100 washers for under £20 that had been deliberately made to fool the machines into accepting them as £1 coins. Coin detectors were again reprogrammed to reject those slugs as well. The Irish pound coin in use from 1990 to 2002 was the same size as the old pre-decimal penny, so vending machines had to be modified to differentiate them. Many machines simply had the pound slot disabled with a riveted plate. Many coin-operated machines in Germany would accept the 1992, 1993 and 1995 stampings of the cupronickel Estonian 1 kroon coin as a German 1 mark coin. This was profitable for users of the Estonian coins as the kroon was pegged to the mark at a fixed rate of 8:1. All cupronickel 1 kroon coins were demonetized in May 1998 and the replacement aluminium-bronze Estonian 1 kroon coin was not interchangeable with the German mark in coin-operated machines. The use of 100-won coins for the slug of 100-yen coins and cupronickel 20-sen (RM 0.20) pieces still commonly occurs, contributing to the continued conflict between Japanese and Korean citizens. Similarly, until 2000, the Korean 500-won coin could be modified to match the weight of the original 500-yen coin which was otherwise identical in diameter and composition, and thereby used to fool weight-sensitive vending machines. From the fall of the Soviet Union to the monetary reform in 1998, the Russian Federation often issued a commemorative one-ruble coin that was identical in size and weight to a 5 Swiss franc coin. For this reason, there have been several instances of these (now worthless) ruble coins being used on a large scale to defraud automated vending machines in Switzerland. In the US, Connecticut Turnpike tokens had a value of 17.5 cents in the early 1980s, but due to having a similar design as New York City subway tokens worth 75 cents it became common for commuters to use the Turnpike tokens on the subway. The matter went unresolved for three years; users were not prosecuted, but when Connecticut discontinued tolls on the Turnpike, they agreed to redeem the roughly two million tokens from the MTA at face value.