Nail them to the wall.
Seriously,Poster gum or whatever its called is similar to blue tack and cost <$1 at wal-mart.
only need a little ball at the contact points.
May leave residue but that comes off with a little alcohol.
Seriously,Poster gum or whatever its called is similar to blue tack and cost <$1 at wal-mart.
only need a little ball at the contact points.
May leave residue but that comes off with a little alcohol.