(Be sure to read this about shims and uprights (spindles).
https://static.speedwaymotors.com/pdf/91024148.pdf[/QUOTE)
This does NOT represent the geometry of the '49-'51 Mercury suspension and just tends to add to any confusion.
Unless you run the oil thru a 3 micron oil filter (as previously stated) the bad stuff goes right thru the cheese cloth and right back to where it came from,virtually unchanged.
To me a waste of time and effort.
Thanks for heads up.
Here are (3) EBAY links far anyone interested.
https://www.ebay.com/itm/393981065979?fits=Make%3AFord&hash=item5bbb19fafb:g:YrIAAOSwkK5frcNQ
https://www.ebay.com/itm/393014565497?fits=Make%3AFord&hash=item5b817e5a79:g:NH4AAOSwcW9frcWI...
As quoted in first post, " then it just quit blasting sand and started blowing air/sand up from the bottom of the hopper."
It is already blowing back into the hopper?
Considering that you choose not to mention which '40 Ford specific hand brake part you are looking for, perhaps you may have to educate yourself to the fact that there are many '40 Ford chassis and body replacement parts that Napa never carried.