most of us who are beatles gear heads have heard of the story where paul, george and john heard that sanding the finish off of a guitar would make it sound better, and so of course they all did. in early 1969, after the white album, the first appearance of paul mccartney’s rickenbacker was in the let it be movie sitting on a stand without it’s paint job anymore. by 1972 or so paul mccartney had sanded the finish once again into the now famous ‘rounded horns’, and i believe that was also when he sent it back to rickenbacker to repair the bridge pickup. but in-between the initial sanding job done by paul in 1969 and the time he took back to rickenbacker to replace the pickup (from 1969 to 1972) did he just not have a finish on the bass? i’m not talking clear finish, i mean completely naked. did he do a home job finish? take it to some random guitar shop? his trip back to rickenbacker may have also been in 1975 instead, as i believe i’ve heard that before.