I push putt.
When I putt I keep my arm straight, nearly locked.
The disc rests on my index finger that is horizontally hooked at the last digit under the lip with the lip in the crease between the last and second digit.
My thumb is on the top plate and is lightly pinched with my middle finger.
My middle finger and ring finger are stacked on top of the pinky which is against the rim. Both ring and middle fingers are pressed against the flight plate. My hand looks almost like I'm pointing with my index finger with my thumb over the middle finger and the rest of my fingers curled under.
When I go to throw I line up the disc with the top of the basket and swing my arm from the shoulder all the way down and then swing all the way back up to the top of the basket to ensure that my throwing arc is inline with the basket, then I go back down as before and come up with the release at the appropriate height.
When I release I flick the flight plate with my middle, ring and pinky fingers as they straighten out to a vertical hand pointing at the basket. The thumb is my pivot point. I release with a neutral or slightly nose up release. Nose down causes it to dive.
I practice this spin when I'm sitting. I'll put a disc in my hand with my forearm vertical and flick it out of my hand with little to no wrist movement.
I can usually hit putts within 20'. The only issues I have are wind and misjudging the power/release height required or the distance. I only miss short or a little long but never left to right. I never have to 3 putt.
There's a distance I can't hit with an added leg kick so I have to do something else, but within that distance It's pretty golden.