I have been doing all my own tanning for quite some time now and I have never had this happen. I had a cape that was just about completey bald after taking out of my tumbler, I use 6 foot tumbler and caging drum. The capes are salt dried until hard, rehydrated in 2 lbs salt to one gallon of water for about 20 hours. Then to the saftee acid for three days, the ph rose to 2.5 overnight on me once. Shaved and returned to the pickle for 24 hours and then neutralized. I neutralized in my pickle with the hides in it, could this be the problem? 30 minutes in neutralized pickle and rinsed and in the EZ 100 for 20 hours at 4.5 ph and drain. Proceeded to oil overnight and in the tumbler for 20 minutes to dry hair. I have not seem to have any trouble with my soft tanned hides. But this one bald cape really has me baffled. Other capes that were in the same load were fine, one more had a slip spot of about an inch though. I know tanning processes have been beat to death on this site but after 4 days of reading I just had to ask. Thanks for any help.