Why this Studio exists
A useful rock-tumbling resource should help after the purchase as well as before it. The batch journal gives your observations a place to live. The field guide helps you interpret the choices and problems behind those observations.
What John contributes
John Morris is the named author and editorial lead for the guides. His role is to define the question, compare exact sources, surface uncertainty, and maintain corrections. The site does not present research as personal testing or claim professional geology credentials.
A transparent relationship with readers
This is an affiliate-supported site. If you use an attributed Amazon link and make a qualifying purchase, we may earn a commission. That relationship does not turn a researched description into a performance test. We explain the basis of guidance and link sources readers can inspect.
Help make it more useful
If an instruction is unclear, a source changes, or a model detail needs correction, contact John with the page address and relevant documentation. The established editorial contact is john@localretention.com; do not send Studio access tokens or private journal text.