I always thru drill after, I run a short bit thru the tail, then I follow w/a longer bit (9" paraboloic) clearing every 1/2",just stopping short of the head, then I cut the lip slot, mark the location of the front loop (line tie) then I drill thru the head to meet my rear drilling, I also do this before I drill my plug weights & hook holes (I find the drill bit veers when it hits other holes).
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