Foxdale Heritage Centre has thanked local volunteers for stepping in after three more window panes were damaged at the building, prompting another visit from police.
The Centre said one large pane and two smaller panes were broken, and anyone with information is asked to contact Peel Police Station.
Security cameras have now been installed as the organisation considers further options to protect the glass.
Volunteers Davey Craine and Stewart Sayers recently replaced earlier broken panes, while Peter Gurney boarded up the latest damaged windows.
