Quote:
Originally Posted by AXett
is it normal?
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Totally normally, as everybody else has already mentioned. It ties the seat into the rigidity of that stiffener on the underside, but without needing to hit dead center on the stiffener when drilling from above (which would never happen).
When you remove the seats and the matching brackets on the underside, they're actually pretty handy. I used them for a bunch of experiments in treating rust; they're in exactly the same state as the rest of the bus underside so they make perfect guinea pigs. This is what showed me that Ospho, Rust-Oleum rusty metal primer and Rust-Oleum high-performance enamel is probably the cheapest, easiest to apply and most effective rust protection there is.
Quote:
Originally Posted by AXett
I'd expected bolts into tapped holes or bolts welded to the chassis.
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Welding on the chassis, especially the flanges which are what seat bolts would attach to, is generally a no-no (it can be done but it requires lengthy preheating and post-warmdown and would not be at all economical). Also, you would not want anything rigidly attached to the chassis rails as the body is clipped to the rails and designed to slide forward a couple of feet in a head-on collision.