[graham.hobart (Graham stevens)]

I just got my replacement bolts for my EQ 6 and after taking the old ones out, I managed to put one back in, the other one- (locking nut?-nearest the Az knobs side) won't fit. So I tried to put the old one back in and now they don't fit either. I cleaned the hole out with WD 40 and cotton buds but still it won't screw in. Any one had this same problem and know a cheap solution that doesn't involve me mailing the whole mount head to some one to re bore and thread the hole?
Bare in mind I am a Luddite with tools.
Help please
Grateful Graz