Pin is loose
Don’t drill to depth. Stop 3-4mm or more short of the drill stop and mallet the pins in. If the Fixation base is lose after all the pins are seated then the bone is probably of very low density. There is no good solution, but can us a cotton plug and wedge between the bone and the Fixation Base to force the metal out, away from the bone. Try to mimic the image on the GSI report. There are images of how the metal should relate to the alveolar bone. Be very careful with assembling and disassembling the guides.