Thanks. Pretty sure mine was 22", but may have been 20".
I've made a lot of trips to IC in the past 30 years, mostly to see bands at Gabe's. Uncle Tupelo, the Jayhawks, the Flaming Lips, Link Wray, House of Large Sizes, Tommy Keene, the Bent Scepters, Alejandro Escovedo, Mike Watt, Yo La...