Some people say that the Atari 5200 had the worst controllers of all time. But they can actually be massively improved by upgrading to gold contacts!
In this video I fit a kit from http://www.best-electronics-ca.com/5200.htm (no affiliation / sponsorship, just a happy customer).
The kit requires no electronics or soldering expertise and is ideal for beginners to the world of console modding and repairs.
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https://www.youtube.com/watch?v=W_Nu9wIHePE