I don't like tapping on a punch against the guide (except for very gentle tapping) because it places all the stress on the attachment of the guide to the frame, and they can and do break if manhandled.
So I usually take a steel ball of the right diameter, or a bullet shaped plug (drill rod, or shank of dead twist drill, shaped on bench grinder) and use a pair of pliers to squeeze it into the end of the fitting. I eject it with a small punch from the other end.
This technique is probably overly cautious for brazed steel fittings, but can prevent detaching the bonded fittings on Carbon or aluminum frames.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.