Hi Steeldragon. I'm not going to suggest you do this, but I'll tell you what I did.
I had some regular 510 cartos, the kind you fill with a syringe and could not get them to
thread into an adapter so I could use them on my 808
threaded Buzz.
A friend suggested gently filing down the
threaded side of the carto with a metal nail file. File a small amount and try, file and try, go around the threads ... and it worked. I was able to save a lot of cartos that I was about to toss. The 510's are worth saving.
Perhaps it would be best to get some other opinions first, but like I said, this worked for me.