Sorry for the delay, been fairly busy and forgot about it.
The machine worked almost perfectly to this point. Only issue I found was i needed to add a bit of weight (5 lbs) to the head. Remember this is a proto type so some adjustments where to be expected. The need for the weight is even at rest the head is not 100% level it tip back maybe 1/16 inch, with the weight added it keeps the vac ports all tight to the carpet. this issue should be easily over come with a adjustment to the bottom bracket where the head is mounted.
Even before i added the weight, there was no tiping or lifting of the head while working. This was something I expected to be a issue. I had expected the drag of the hoses to work like a fulcrum and lever and lift the head while working forward. But this was not a issue.
The stability of the machine is incredible and makes working it with one hand a very simple operation. It is almost not like work at all.
Someone was concerned about the stock handle would be awkward to use when pushing. This is not the case. the handle is very comfortable to use weather using with one hand or 2.
Adjustments that need to be made before selling this kit.
1) adjust the head mounting to insure a tight even interface with the carpet without the need for the weight.
2) adjust the support bars so the head can tip back for storage without hitting them.
3) add a locking mechanism so head can be locked in the tilt position for storage.
All in all this design is a winner.
PS. this design also had 1 more benifit I did not think about when I thought the concept up. It allows the unit to be used in much tighter areas with out the risk of bouncing it of walls and furniture (such as a tight area between a bed and wall) as long as the area is big enough for the width of the machine to go into