Kenwood TS 820s websites:
https://nr6c.com/VFO%20REPAIR.pdf
https://kd7dny.com/product/hybrid-parts/
https://www.kenwood.com/usa/Support/pdf/TS-820S.pdf
https://www.rigpix.com/kenwood/ts820s.htm
https://www.ai4fr.com/main/page_ham_radio_kenwood_ts820.html
https://rigreference.com/rigs/3510-kenwood-ts-820s
https://www.youtube.com/watch?v=A6lvcuTJ7Xk
https://www.youtube.com/watch?v=w8n7Zfk2olE
https://www.youtube.com/watch?v=j3X56eaRo_Y
https://www.youtube.com/watch?v=sqxBr_R3Sbk
https://ac0c.com/main/page_gear_mods_ts820s_mods.html