Taking my first step into kegging and found a used keezer online that I'm picking up this weekend. The seller is keeping all the faucets, shanks, etc. So there are 6 holes in the collar ready to go. My problem is I can't afford 6 faucets right now and just want to start with 2. So that leaves me 4 holes in my keezer. How can I temporarily seal these up? I want to add the additional faucets soon, so I need something that will be easy to remove when the time comes.