Need a funnel in a pinch? Cut off the bottom of a 2 liter or 1/2 liter bottle. This works great, and only costs 10 cents (which is the deposit price in Michigan). You can make it as tall or short as you want.
Don't own a rubber mallet? Just cut a slit in a tennis ball and place it on the head of your hammer. Keep the tennis ball in your tool box and you will always have it handy.