Custom Fit Your Cylinders, Cheap

It’s been said numerous times that a 1/4” difference in cylinder diameter is a big jump. Even 1/8” can be a little too much, depending on your goals. A firmly packed tube is great for length work, so long as the skin doesn’t stick to the walls. An oversized tube is great for girth, so long as its not big enough to let a testicle to get sucked in. As with all things, there’s an optimal, and with pumping, that sweet spot changes week to week as girth in the pump improves. I’m estimating, and testing, that 70-80% packed is optimal for both length and girth at the same time. So far, it’s working very well.

My solution to the problem was to use something to take up some of the cylinder’s cross-sectional area. First, I tried silicone rubber. It worked, but it has too much grip and pulls the skin. So next I tried lexan, and it works even better but it’s a pain to form the shims. I’m about to order a sheet of low density polyethylene, and hopefully that will be the best. Its easy to cut, flexible, slick as hell when wet, and best of all… cheap! I should be able to make all my shims in about ten minutes and be done with it. I’ll update with how that goes.

Doing the math, I found the optimal sizes for the shims, and also figured out that I only need three: 6.25”, 4”, and 2” are perfect for going from a 2” to a 2.25” tube. And because they can be stacked, that gives me 5 steps in between tube sizes to keep me packing in that 70-80% sweet spot. I just cut the plastic to 9” long, and then cut each to width and form them to the tube however needed (hopefully LDPE is flexible enough to just lay in there like the silicone does).

The results so far (three weeks in):
-April ‘22: Started in a bare 2” tube that I couldn’t pack at all, and couldn’t get a length pull near my BPEL (7 7/8). I was just barely starting to pack the tube around my thickest point
-July 28: Started using a 1/8”x5” silicone shim packed around 60% and immediately got to my BPEL in the tube
-Aug 2: Switched to a 1/8”x2.25” silicone shim because the other was getting too tight. Got to 8”
-Aug 12: Switched to a 1/16”x3.25” lexan shim, packing about 70% and getting up to 8.2 in the tube
-Current: Packing too tight and need a smaller shim, hitting up to 8.25”

I’m packing all but the last 1/4” behind the glans, but I don’t want to fool with the lexan again unless I have to, so I might just raw-dog the tube this afternoon and see what happens.

Update: This definitely works for length. Took new measurements today (no PE since yesterday AM) and I’m now 8x5.75”. Up an eighth from when I started pumping, but I’m almost positive that has happened since the beginning of August, when I started getting above my BPEL in the tube. I’m surprised I haven’t gained any girth in four months of this, but I’m definitely sticking with it. Still haven’t downsized my shim because I’m, well, just lazy I guess.

Another interesting point is that even though I’ve been doing minimal manual stretching, my pre-session BPFSL (8 9/16) is now more than my post-session was (8 1/2). And I’m only getting a length pull in the tube just over 8 1/4”.

Removed the shim and did a long session this morning. Packed about 50-60% in a 2” tube and still got a good length (8.25”). I’ll stick with this packing percentage for a while and see if it works better for balanced gains. I’m also replacing two pump sessions with manual clamping because of the girth gains I got from those in the past.

I’ve always felt that anyone who could invent a cylinder that increases or decreases in size—incrementally—will become a PE millionaire, or maybe thousand-aire. But your shims sound like the next best thing. Do you have any non-nekkid photos?

I’m just sharing the idea. The material is cheap and there’s not much work to it. And three shims should be all you ever need (unless you have to switch to a longer tube). LDPE is less than $14 shipped for a 12x24x1/16” sheet. That’s enough to make two sets for 12” tubes.

Pictures of what? The tube and shims?

+1 pics of tubes and shims and how exactly they fit together when in use. (Just the tubes/shims, no need for an active demonstration).

I just got the new shim material in. After I cut and finish them up, I’ll take a bunch of pics of how the whole shebang goes together and post them. LDPE seems like the perfect stuff. It’s cheap, flexible, and slick. Now I just have to see how it holds up over time.

I didnt understand how these shims work. You would cut the LDPE and place on the wall of the cilinder? Several sheets?

I’ll have the privacy to take pics this afternoon. It’s hard to describe, but simple to understand once you see it.

Yes, just the materials.

The materials (except the seal) and how the small (2”) shim sits in the tube

All three shims in the 2.25” cylinder. The 2” and 4” are side by side, and the 6.5” is inside of those.

As you gain in girth, you remove the small shim. When you outgrow that, you replace the medium with the small for more room.

So these are L+M, and L+S

Then you progress to Large only, then to Medium only, Small only, and then bare tube

And here’s a complete setup with the seal.