Harley, By jove , I think you've got it!
Geoff.
I had a whole wall of shelves come down on me with the self tapping anchor
>screws. The hole gets enlarged as the drill point wears, and in old concrete
>the holes are crumbling on the surfaces.
>Best anchor is lag bolts and expansion shield inserts. The expansion shields
>are about 3/4" long. I have a 3/8" combination hammer drill/drill that works
>OK. If you can though, borrow or rent a Hilty . They put holes in old
>concrete like going through butter.
>Harley
>
