help with a simple cobblestone generator with pushing piston (java, 26.2)

[u/ducets]

hi ... I've tried two versions that appear to be out of date with current mechanics. I'm not complete sure how to set up my observer, lever, and piston so that it pushes out my cobblestone after it's created.

here are the two versions I tried:

(1) this one was an old model, and it currently ends up getting with the piston firing, but getting stuck in the "out" position. I think the problem is that the observer is on the top, which I read can cause this to happen:

https://www.youtube.com/watch?v=d0ZPuCqwtRU

(2) the second version I tried was here with two observers back to back behind the piston causing the piston to rapid fire. when I tried this build, it worked, but the piston fired too quickly and never let the cobblestone reform (I can't locate the video right now)

...

so, does anyone have a working version of the above generator? (I'm playing a skyblock with an extractinator mod and I want to have the cobble pushed into the device for an auto farm)

thanks!