Related Clues:

• Ties
• Bolts
• Buckles on
• Affixes
• ...
• Secures
• Closes securely
• Attaches firmly
• Uses a buckle
• Attaches securely
• Makes secure
• Fixes the inside like X
• Set off among supporters for ties
• Buckles, as a seat belt
• Two beginners in engineering succeeded after quick fixes