Your bass must be an ICON or Ignition model which both have a different neck ount and there is no cantalevered extension of the neck and fretboard over the body (no gap). Maca's 1963 500/1 has the gap which is about 3/16" tall extending under the 18th thru 22nd frets. Paul's 500/1 does have a strap button at the tailpiece mount and he attached his strap with a folded piece of leather the goes thru the "D" shaped ring on the strap end and the folded leather has 2 key holes that slip over the body strap button. The neck end of strap has a rawhide string that ties to the leather strap after slipping under the neck cantelever. I believe Paul's 63 bass now has a strap button on the neck end of the body. He also would sometimes attach the strap clip to the top side of the tailpiece.
