Here is a lense mount I made from a eBay sourced c-mount to canon adapter, a 3d printed conversion tube and an old lense from some camera or another. This lense lacks a focus ring but it does have an iris. I think it is only good for close ups.
Very minor fabbing related post, I made some little feet for this strange air bubbler that I salvaged from a kids toy. It’s all selt contained and I just had to add a battery and a switch. But it needed little feet in order not fall over. So I printed some in black plastic. Now I can set it up in front of the little webcam I have and it will become part of the performance piece I will be doing in Saskatoon on Saturday.