I just got the disk in the mail from the FC member Tintest that he made for me. He actually made some a while ago, but he made them using brass, so I had to pass. He recently emailed me saying that he had some SS disks, so I grabbed one from him.
So far I'm very impressed by the difference this little thing makes. I would say that it has improved airflow by at least 25%. The abv comes out very evenly browned, but my Solo has always been pretty good in this regard anyway.
It made for more comfortable rips from my bubbler as it decreased the drag enough to really notice the difference.
I know a lot of you guys gave him some shit for selling them for $25, but I think it is a fair price to pay for his labor alone. I'm sure as hell not gonna go out and make one from scratch, and I certainly couldn't do it in less that the time it takes me to earn $25. Besides, he didn't come here trying to sell the things, he was just sharing his mod and he was then asked if he would sell them.
I wouldn't use it on the go, though as it would be easy to fall out when emptying a load by an inexperienced vaporist, an the disk gets really fucking hot. My buddy had it accidently fall into his hand and he screamed like a bitch.
Anyway, I have no idea if he wants to make anymore of these, but if you're interested, I'm sure he'd entertain an email. I give it