“I want to get my hands dirty and do some gardening. I want to design pinball machines.” RYAN ADAMS BURSTS through the door of Rivington Guitars, the tiny East Village instrument shop where he’s asked me to meet him, and immediately launches into a conversation with the owner, Howie, about the red 1983 Les Paul he bought there last November. “Dude, [the Smiths’] Johnny Marr’s guitar tech sent me a DM on Instagram and goes, ‘You chose wisely—that’s the same guitar I bought for Johnny,’” says Adams, 42, wearing a Black Sabbath T-shirt under a leather jacket with an Iron Maiden logo on the back. “He told me to go on YouTube and watch [the Smiths] play ‘How Soon Is Now?’ on Top of the Pops. It’s the exact model…