Weight method with the retainer using Nylon screws
I use 1 1/4 inch OD by 1/4 inch ID stainless steel washers. Any washer can be used but I find stainless steel to work great since there is no chance of rust and are just cleaner to work with.
Medical tape is a good way to keep your stacks of washers from turning you into a human slot machine if the wing nut came loose and all the loose washer fell to the floor.
I used weight with the DTR in the past but found the Retainer to be a better devcie for that job since it is more compact.
The nylon screws that come with the Reatainer can be used for spacers or weight.
As you can see in these pictures the 2 inch nylon screw will provide 5.3 oz of weight and the 3 inch screw gives 10.6 oz of weight.
Using tape is a much more covenant way to use washers. I just make stakes of different weight and can use what ever amount I want quickly.