Logitech C270 spotting scope adapter (eMarth, Leupold, Bushnell)

I made this to put a Logitech C270 720p webcam on an Emarth 20-60x60AE spotting scope, which has an eyepiece with an outside diameter of 39mm.

I have also added a 45mm version based on a friend's Leupold spotter and a 47mm for the Bushnell Legend T series (https://www.amazon.com/Bushnell-Legend-781545ED-15-45X60-Reticle/dp/B01BNSHXCU/ref=as_li_ss_tl?crid=1OF5H0EH7ZSHZ&dchild=1&keywords=bushnell+spotting+scopes&qid=1585998328&sprefix=bushnell+sp,aps,161&sr=8-4&linkCode=sl1&tag=gucaante-20&link