Related Clues:

• Hit it on the head to be dead right
• Steel pin used by carpenters
• Hit it on the head to be absolutely right
• Hit this on the head to be bang-on
• Device that closes clothes - may be a zip
• Horny covering of the digits
• Hit this on the head to be absolutely right
• Hit this on the head to be dead right
• Device for joining things together
• Hit this on the head to be right
• Metal pin, hit it on the head
• Small metal spike
• It may be driven five-in-hand?
• That might be driven five-inhand
• Does that fix it so that one can accelerate?