G’day BDA,
Yes, mine’s a stock S2 frame. They’re all like that, sir.
. . or at least that's what I'm presuming.
However, I’ve incorporated a longer boxed in piece at the location we’re talking about and I can stick my finger in (through an access hole) and feel the welded-in steel piece.
My guess is that it’s about 3/8 inch thick.
I added on 1/16 inch for the frame thickness and another 1/8 inch for the crossmember mount. That’s how I figured 25mm (1 inch) bolts would be fine.
I’m not sure how mine might be thicker than yours - seems odd.
Looking at EuropaTC’s pic, his looks roughly the same leg thickness as mine. Dunno.
One other
thing that’s not clear to me is where Bernie says he has to
“go through both sides of the main frame”.
If that’s the case, I trust he has some spacers (welded in or otherwise) between the inner and outer box section faces.