I had contact with Bob way back when he tracked me down to ask about my Flues Marlin 1881, but haven't since. I knew he was trying to put together a possible book and had issues with someone plagiarizing info he'd provided, so he was somewhat secretive whenever I tried to get any info for my research on Flues as it might pertain to my 1881.
Appears he's not been here since 2020, and I hope he's still with us, and doing well!