Hi There, I lost my Ring & Middle finger tips using a router 6 years ago Ouch!. Like Tony Iommi I had to find a way to play my guitars & bass, I tried the multi color toy silicone finger guards made in China but they did nothing to help me for my missing finger length or the pain. I Googled Tony Iommi again and found Galaxy Guitar Products Finger Protectors. I ordered 2 about 3 years ago, happy to say I am back to playing my musical instruments & can even type on my laptops for work- no more pain. If you lost the tips as I did over an inch on each finger I was bummed for a long time but now I'm back to playing. Check them out, they are made in America here is their link, https://www.galaxyguitar.com/ft1.html
I hope this helps someone who went through a tragic accident like I went through. Never give up. Good luck, rock on.