bark tanning is something i haven't tried....would like to learn more! does it still require the same stretching and pulling over a cable?
yours is a similar conclusion about a recent brain-tanned skin. One had spots hardened up when i thought everything was fine.
resoaked in brain solution wadded it up loaded with brain soup,and stuck it in a ziplock in the frig for several days. After working it over a cable again, now it's fine.
try try and try again...