I don't see any reason why it can't be 1 brush.
you'll probably have to get creative with a set of brushes and a file ( to make something fit) if you can't locate them
lets get this thread back on track. insults and derogatory posts against anyone will not be tolerated . in this case user has been permanently banned , Unless @Ryan feels differently.
well I searched what has easier torque, and got this
Standard V-threads are easier to turn and require less torque than Acme threads under the same load because they have less sliding friction
Acme threads deliver lower mechanical efficiency than standard V-threads due to higher friction from their trapezoidal geometry, but they excel at handling heavy axial loads and power transmission. [1, 2, 3]
Mechanical Advantage and Efficiency
Standard V-threads (60-degree angle): Provide...
yes , use the black screw & one of the silver screws . as mentioned if for example "off" is the wrong way, switch the silver screws, or rotate the switch 180°
A 5-point "buffalo wrench" or penta socket is a specialty 5-sided tool designed to open tamper-resistant "Buffalo" utility covers used by gas, electric, and water companies to protect underground shutoff valves
very doubtful that's accurate information. paper delam is normal when wallpaper is applied over thin/non existent sealer coats of paint, as appears to be the case here