Should I send a cape that is starting to slip to the tannery or handle it myself ?
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from whitetail designer systems would probably be your best bet. check archives for info.
Then after this could it be safely sent to a commercial tannery ?
Would handle it myself. You can be as gentle as you want. It will be more man handled at the tannery. Not cutting down tanneries in any way here, also, you send hides to be tanned at your own risk and they are upfront about that. If it's slipping now, well you can figure out the rest.