M3 brass nuts:

https://www.amazon.ca/Knurled-Threaded-Embedment-Printing-Projects/dp/B0BMVHYGWM/ref=sr_1_6?keywords=m3+inserts&qid=1707870077&sr=8-6

Sealing cord:

https://www.amazon.ca/gp/product/B00R0VW4S8/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

M3 Screws:

https://www.amazon.ca/Socket-Screws-Bolts-Thread-100pcs/dp/B07CMSBQ11/ref=sr_1_4?crid=3H0YW0Z3H88WU&keywords=m3+screws+hex+10mm&qid=1707870555&s=industrial&sprefix=m3+screws+hex+10mm%2Cindustrial%2C149&sr=1-4