Probably said use U-bolts?
May have said drill web (not top or bottom flange) if absolutely necessary.

My 48 frame had something stenciled in the same place about not welding, wish I had a good picture of it before sandblasting...

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-