Related Clues:

• Make effort using rivets
• Try hard for rivets
• Bring to bear, perhaps influence
• Try hard, carry on conflict
• Try hard, make an effort
• Bring into use, say strength
• Try hard to break rivets
• Bring quality or influence into play
• Bring into use, strength or influence
• Exert much effort
• Bring strength into use
• The way to try to get four in among the rest
• Struggle earnestly
• There's nothing in such a reign to make one pretend it's not there
• Try hard to get the river to the right a little