sorullo

yeah i really have a huge issue with my del sol.. the bolt of the front right lower arm, I cannot tighten it!! is the first bolt that goes into the chasis .....not the one in the damper unit. the first one in the other end.. i really don't know if it's the nut inside the part.. cause is sealed and i can't see what's inside.. does it have a nut inside or is a factory made nut sealed togeder with the chasis.. ?? please i really need help with this..however i can't tighten it but the bolt does not come out either!! so i manage to drive the car still...but i do not wanna drive like that cause I Don't feel safe!!.. please guys if you can help me with this I will really appreciate..
thanks.