BODY LANGUAGE XIV
The Puzzlemaster Presents
Will Shortz

Think of two particular parts of the body in three and four letters, respectively. Insert the three-letter word exactly in the middle of the four-letter word, and the result will name something that's sometimes found on top of a building. What is it?

HINT:
The three-letter body part starts with L.

Answer:

LIP - HEAD = HELIPAD 

(Not so great a) Bonus puzzle from JA:
Can you put another three-letter body part inside another four-letter body part to get a brand of toilet paper?

Answer:
ARM - CHIN = CHARMIN