Can you please provide the source for these 'flanged washers'.
I've wondered for years how you keep the top of a carriage bolt from spinning out and now I know !
I searched on flanged washers and could not find them on ebay, so I'm wondering if they go by another name?
Thanks for posting your build.
[quote="Tommy2tone_1999"]Roofing Asphalt Compound applied to bottom side of floor for waterproofing.

Using these fanged washers to allow me to tighten the carriage bolts that secure the floor to the trailer frame.
