[Mike O]

And therefore...... the sweetspot , as commonly conceived; a , singular, point ... on the face of the club, moves, as the #3pp (assuming a right hand low grip) chokes up or down on the grip. In other words.......The "sweetspot" is not a permanent spot...............like the....spot on my trousers say. Just saying.

OK OB - Your post is accurate - spot on - correct and scientifically "verifiable", however bothersome to me. So let's move down this road a little further and cover two different perspectives of your post with my own clarifications (maybe not relevant to anyone else).

Perspective number one - LCOG - clarifications:
1) Based on the amount tha you can practically choke up or down on a club - you're not going to be able to move the sweetspot much.
2) If done properly and you are sensing the LCG sweetspot - doesn't really matter on a practical level where it is - you'll bring it to the ball.
3) Finally for clarification for someone new - #3 pressure point is used as an "essential" element in Homer Kelley's writings - it's closest to the club - but it's not the only place one should feel lag in the hands or body. A table is defined as a flat surface with supporting legs - that leaves a lot of options - i.e. it's not ONLY that.

Perspective number two: - WCOG:
Based on items #1 and #2 above - when you choke up or down on the club - the bigger practical issue you change - is the "Widthwise Center of Gravity/"Mass" commonly measured as Swingweight. WCOG changes (i.e. choking up or down or changing the distribution of weight in the club) affect release issues, timing issues, and has a greater influence and required adaptations than LCOG changes.

In summary, choking up or down changes the LCOG and the WCOG - however the WCOG change requires more adaption for the player.