We do not have specific trimming instructions for the Ventus Red iron shafts. What I have found is that Ventus Irons are usually .370 parallel tip and the Stealth irons do take .370″. IF the shafts you have are definitely .370, it is possible they are trimmed like the other Fujikura parallel tip irons shafts, which is our trim code IR6, which is .5″ for a 3 iron, with .5″ increments through the PW. I would measure the parallel tip section length before cutting to be sure there is enough parallel tip section length to handle that trim.
Britt Lindsey