I work in an office where everything (handpiece connections, air/syringe, HVE valve, saliva ejector valve, space to place instruments, etc.) is at the 12 o’clock position.  The patient chair is only a patient chair.  There is nothing connected to it.  As you can imagine, this sucks for ergonomics.  I work out of 8 chairs (6 in an open bay for pedo patients and 2 in private operatories for adults) and because I move around quite a bit I needed a mobile solution to re-locate at least some items to the 2 or 3 o’clock position.  The first thought that came to mind was to purchase a traditional dental cart on wheels, but those are quite expensive, so I decided to visit Wal-Mart instead where I picked up a few of those cheap Sterilite plastic 5-drawer carts on wheels.  I also purchased a pack of HVE valve and saliva ejector valve holders from eBay and then picked up a few small bolts/nuts from Home Depot.  What you see below is what I came up with and they have been working great for at least 2 years.  One of the wheels snapped off of one of the carts after about 1 year, but that was the only issue.  These carts get rolled around quite a bit in my office.

These are our sealant cart setups. They provide a nice work space on top and all needed supplies are stored in the drawers.

Everything is positioned at the 12 o’clock position

HVE and saliva ejector valves.

This is my ultrasonic scaler cart. With an internal water source I only have to plug it in. I can roll it easily from chair to chair as needed.

HVE and saliva ejector holders. I just drilled some holes in the cart and bolted them in place.

The top of the cart has enough room for the scaler and hand instruments.