Hey guys, Long story short: I want to install casters on a 4x10 cab. However, before I start drilling into the wood, I want to make sure that I'm not going to accidentally drill into a wire or something. However the problem is that I can't see any screws allowing me to open up the back so I can make sure no components are in the way. There are screws on the rubber stoppers on each of the eight sides but even if I were to take those off, the felt/fur covers the entire cab, it doesn't stop at the back These are two pics I found on the internet that are the exact same as my cab. How would you go about solving this issue? Smaller screws that might be less solid and take a chance? Simply getting a dolly? Thanks for your advice!