there was an onahole that had bars going across the inside a few years back. iirc, it was all a single material cast. no idea how they managed to do that, seems like a crazy topographical challenge. probably a two piece ‘core’ that they separate before removing. I tried to find pictures but I can’t find anything.
who would have thought that japanese companies would be the least conservative? lmao
Japanese products make more sales because they are gimmicky and not necessarily good.
I used to have a sleeve that came with these little ‘spike balls’ that you were supposed to put inside the sleeve during use, and they would shift around while moving. It wasn’t very good, but it was a novel idea.
There was another where the whole sleeve was shaped like a phallus, and the gimmick was to simulate docking.
There’s also a bunch of oral sleeves that have plastic teeth in them. Ouch.
And who could forget… graaaaan sliiiide!!! 
ahem, my problem is just the opposite
figured out a way to expand FLs permanetly without destroying them over time. Literally heat it at around 125 degrees F for a few hours stretched out in the size you need. BAM, you have a size FL dosent offer out of the box 
For most people quickshots are too small, and its part of the design. You are ment to be able to push entirely through. All other designs are generaly a bit oversized, as that enables more people to use them, meaning more sales. Its not realy a problem, as that just depends on whether you like open ended sleeves or not.
Costs to make them once you have a mold are often very low. The mold is usualy the expensive part as it needs to work in an automated system and be durable for it. So more designs for more dick sizes becomes significantly more expensive. They will most likely never make something that for you is the perfect size because of that.
A very common (and effective) thing people do is cut the sleeve shorter, while still using the normal container. It will reduce the weight a lot, and if desired can make a lot of fleshlights similar to quickshots, enabling you to push through. For sleeves like the boost blow it wont work well, as the lack of sleeve will reduce pressure sensations, But technicaly even here there are tricks you can do (fill the cavity with something else that is lighter like a balloon, only a small airtube is needed for it to work again)
Its not a shame to modify your fleshlights in this way, since you are getting rid of a section you otherwise wouldnt use. And as side effect, if neatly cutted, you can also use the other section as stroker.
Melting fleshlights to me sounds like a bad idea. Sometimes materials can change in such way they become a health hazard (from my knowledge, fleshlights are safe here). Most important: if it works, it works. If you like the result, you obviously did a great job. In the end, its about what you experience, trying to find the limits here is something i can only recommend.
