Arbor for slitter saws

[Frank S]

I don't have my horizontal mill online as of yet but find myself in need of making a slot in some tubing. Not wanting to cut the slot in with a torch or plasma and I am allergic to doing it with a right-angle grinder next option was to pair up to saws on an arbor and mill them in with my bench mill only I didn't have a suitable arbor to make 2 parallel cuts a the same time.
Enter a sacrificial 1 inch T50 arbor
cut by a chop saw

cleaned the end in a lathe

mounted in a 1" R8 collet