Multipass base with quick release

I really like this version of the Multipass because it perfectly holds a credit card. However, I wanted us use this for cards that need to be removed frequently (for swiping or showing information the back), so I made three changes to the standard base. 1) I increased the thickness of the card opening just enough for the card to slide easily. 2) I added the opening on the back, so you can pinch the actual card to easily slide it out. 3) I added the retainer clip to prevent the card from accidentally sliding out. This enables the card to slide out easily when someone wants to scan it. The hole in the back might allow RFID chips to be scanned without removing, but I have not tested this.