Don't Stop The SPIN!
I have fabric dispensers for my two GE washers, and I am bidding on these as they are NOS, and I will share if I win.
When using these, you cannot stop the spin cycle. If you do, the softener drops into the filter flo pan and then the wash basket and will be lost out the drain when you restart the spin.
It is very cool to watch the softener gragually spin out of the inner chamber and out to the sides, then when the spin stops, it drips into the filter flo pan. Bypass the lid switch to take a look. It is definitely more exciting than pouring softener into a mystery chamber, though the final outcome is the same.
MK in LBC