SOURCE nail glass attachments do not have an extended warranty. Glass items are only covered from manufacturing defects and must be stated within 48 hours of receiving your purchase if they arrived broken.
If you're having trouble removing your glass after uses, do not pull harder! Slowly pull from one side to the other to slowly free the glass from the attachment. You can also use 91% isopropyl alcohol to clean any material that is making the glass stick to the attachment.
If you have recently used your attachment, allow it time to cool down before removing or replacing the glass. Heat expands materials, allowing it to cool down will prevent any damages.