Bryan's on to something- what you do is chuck your grade-8 bolt in the drill press, and use a 4" angle grinder to put the right taper in it. Make an angling template, mount it on the press table, and follow it really carefully with the grinder... in a pinch, I'd do it... but I wouldn't do a whole set of five... mebbie one or two...
Of course, it's at your own risk... I don't know you!
DK
Of course, it's at your own risk... I don't know you!
DK