Don‘t know if this is the right board chapter… - if not, please move properly.
I‘d just like to report my experiences with the Inchmaster waist expander and ask for similar experiences.
Background is, my 777-UHR has become a little tight in the waist. Either I gained some weight or it it shrank too much. It was still in the period of breaking in, so just two soaks and some wear.
Nevertheless, at the end I wasn‘t really able to close it without some efforts and squeezing myself in. Wear was not really comfortable.
So I stumbled across the Inchmaster (German: Bunddehner) available for around 20 €/$/£ at several sources in the internet. There are several brands but it seems to be the same device. It had enough good reviews to give it at least a try.
I was a bit sceptical if this plastic device could handle the 23oz. double waist band of the UHR beast.
To make it short: it can!
Action is quite easy: Simply wet the waistband, put the device in and stretch stepwise. Keep wet during the stretching period. I did this repeatedly for 6 hours and let dry over night with the Inchmaster in.
I gained about an inch in the waist so now I am able to close and wear it comfortably.
So this little thing works quite well even with heavy denim.
And it is good to know that there is a little „backup“ when jeans or other pants become a bit tight in the waist 
So maybe this is useful for others.
Any other experiences with this thing?
Best wishes and a sunny weekend!