Drill the holes about 4 cm deep. When all holes have already been pre-drilled, clean up the window with anti-static fabric and anti-static cleaner and switch it using the duct tape. As far as toughened glass, the basic alternative is often 4mm toughened glass. From there, you'll be able to https://louistqkdu.59bloggers.com/27239496/detailed-notes-on-secondary-glazing-vs-double-glazing