Bushing trouble

Try hot water for 15 min or so.
I don't know what to do with those bushing i have boiled them for an hour or longer and they are still hard as a rock,They are the inch and a half in the front the back one work fine but the front i have no idea what to do,Do you think if i put them in the freezer it will draw them up don't like much but enough to piss me off....LOL thanks for any help.....