Gee, our Boler doesn't have any spray insulation used anywhere. Vinyl coated foam, (Ensolite) glued on, is used. I can access our hinge bolts easily from inside. Obviously you will have to dig out this "spray foam" with a small circular hole saw at low speed to get at those loose hinge bolts! After tightening, grab a couple of plastic furniture "plugs" to leave a nice looking finishing touch! Home Depot items...