Is this a good or bad idea?

So I’ve figured out why I’m not getting the results I’m expecting out of the penomet. Its too damn big. Entry diameter is roughly 2.5”. I should be using a cylinder with a 2” opening. You live and you learn. Anyway I’m gonna put it away until I get to that point. In the meantime I’m gonna get a proper setup with gauge and all. My thing is I really wanna work on the size of my glans. I’m naturally a baseball bat. Roughly 5” at the base with 5.5” mseg and a head that I’m kinda insecure about. With the new pump I plan to get I was thinking of getting a sleeve/seal to go along with it. My idea was to use this to insert myself just far enough in the pump so that the focus is on my glans. What do you guys think?

I’ve tried that with my Thickwall tube with the silicone ‘cushion’. It kinda works, but as you have to hold the tube to stop your penis getting sucked into the tube, it gets really tiring long before it is likely to be effective.

That stinks. I think I’ve seen tubes/setups that focus on the glans specifically but they’re hella expensive. Anyway thanks for the input. I may give it a try for the heck of it.