Mount: https://www.thingiverse.com/thing:4790555 Camera: USB Endoscope Type C Borescope for OTG Android Phone, Windows PC, MacBook, 5.5 mm 0.21 Inch Inspection Snake Camera Waterproof, 16.4FT Semi-Rigid Cord with 6 LED Lights (16.4 ft) https://www.amazon.com/dp/B07PBF6DX5/ref=cm_sw_r_apan_glt_i_GK5G9JW9C1GT0X81TZR9?_encoding=UTF8&psc=1
*get the 1080p camera, the one above is only 720p learned the hard way
USB Endoscope for OTG Android... https://www.amazon.com/dp/B07PBF6DX5?ref=ppx_pop_mob_ap_share
There are borescope cameras, this one has a hook on it. Or wrap it in tape, or sticky blue tack, bubblegum.
https://www.amazon.com/Seesi-Endoscope-Waterproof-Inspection-Semi-Rigid/dp/B07PBF6DX5
If the thing can wait for shipping.
There are also long grabber tools.
https://www.amazon.com/Flexible-Grabber-Bendable-Reaching-35-4inch/dp/B08D8H1D5X
You could tape the camera right to that.