I have run across a print with a callout for a dia. with a taper allowance in terms I've not seen before. The callout reads dia. .123 +/-.005 .015 inclusive taper per inch. Does this mean .015 max taper, 0-.015 taper, .015 taper W/I block tolerance? Does it mandate a cone? I'm in the weeds on this one, any ideas? Thanks!