I don't know how to help but I will go through some possible solutions. I don't understand why this is happening.
Maybe he should not pull back the foreskin, and also make sure he are clamping down the chamber all the way. It's important to clamp down all the way (the chambers are touching each other) so the pads in the chamber are grabbing the inner tissue.
The thread:
Slippage solutions that you will find in the,
List of important threads are explaining how to do this.
It involves putting a piece of wood on the top part of the chamber in order to make the clamp down point harder, and also to prevent the upper chamber from tilting forward so much. This have been essential for my gains.
It should look like this when you are fully clamped down in the chamber.
Picure: Chamber with penis from the side.
Clamping down fully.
The picure is from the thread: Slippage solutions.
Personally nowadays I'm not pulling back my forskin becouse I only do expressive stretches, but I could not do that in the beginning because my flaccid length was shorter then.
But it's important to make sure the clamp down point is right. This is explained in the thread,
Slippage solutions.
But the short version is that:
In order to get the clamp down point right: Push the chamber into your fat pad when clamping down. Simultaneously as you stretch your penis forward and hold/push on your glans diring the entire clamp down procedure.
That is: You clamp down lower then you think you need, in order to clamp down to get the point behind the glans perfect (or the extreme base = expressive stretches).
You know you have it perfect (clamp down point) when your foreskin do not move forward so much when you are stretching (this is true either if you pull back your foreskin or not), and you also know you have it perfect, when you feel a tug in your inner penis and ligaments, when you stretch and do reverse kegel.
This method will ensure a solid clamp down point with no slippage. This is explain more in the thread:
Slippage solutions.
I do not classify the wood on top of the chamber as a modification, because the tilt would happen even if the chamber was made of metal. It has to do with how the force from the wing nuts are applied on the upper chamber. I believe the area of the wing nuts are not big enough to apply the proper forces in order to prevent the tilt. The wood needs to be flat on the side towards the chamber, in
Slippage solutions I use a broomstick.
For me it feels like this brothers Frenelum gets sore because he are not getting enough inner tissue stretch/grabbing. My belief is that when he clamp down the pads in the chamber are just grabbing the outer tissue/foreskin, and he are then just stretching the outer skin and this action are pulling in the Frenelum.
- Ask him how much the foreskin are moving when he stretch.
I hope all this information is helpful.
Kind regards.
