Last night i took the two bolts out of the front of my Mazzer Major to remove the filter holder fork. I assumed that there would be captive nuts behind these bolts and I could just screw the bolts back into the holes. It turns out this doesn't work, the bolts just keep spinning. Has anyone who has opened one of these up know if that means there are two nuts that are sitting inside the housing somewhere ans if this is likely to be a problem? I have not intention of putting the fork back for now but I'd like to secure the bolts.