Hi there fellow fleshlighers lol.
I have seen some people talk about mods for the fleshlight so I wanted to throw some of my own in here. I have one of each inner style but the new vibro. So I did some experimenting with the inserts that I didn't like much.
First Mod is for those who use the sextoy adaptor.
The fleshlight loses suction control because of the adaptor end not being a screw on anymore. So one trick I used was using a straw and a good quality chop stick to stick down in the front of the unit. Though this will blow air back at you, the unit now is suction controlled based on airflow difference between straw size and inner chopstick. The chopstick is needed because the fleshlight will attempt to reclose the gap and cut off the use of the straw.
Second mod (will damage the fleshlight!)
This mod will damage the fleshlight but it also keeps it continually warm. I attempted to have a constant lube system but the rubber bands I used cut it off too much to work. I think with some work you can get a constant lube system.
The idea came to me as my frustration with the hot water method and the limited heat storage of the fleshlight. However What I did was bought a cheap thin heating pad. Then in my first attempt, I tried to stuff it into the fleshlight case. And I got it in about 90 percent of the way. But 90 wasn't good enough. So I took the heating pad's outer cover and wrapped it around the outside of the flesh light insert (innermost on the circle) and the heating pad (which is wrapped in a circle around the fleshlight). Then I put rubber bands in place to keep it all on. The rubber bands don't seem to limit my cock from going inside and it always feels tight and good. Though no actual suction control only little air seems to pass my final rubber band. The damage comes from high heat that I use and the rubberband. Somehow the rubberband is making that area basically a heat collection point and leaving a permant melt mark. It has not left a hole like my original did after some bad idea experiments. (I hated the original)
I suggest using a fleshlight that you kinda like for this idea not the one you love. I used either wonderwave or vortex. I have a tera twista that feels the same and left the tera alone. My mouth super ribbed is my never going to damage one and used for the first mod.