I don't get to buy much vaping stuff these days. I got plenty of everything I need and I don't feel the urge to try new gear.
Last week I did order some spare screws for KFLs from McMaster Carr. Bit of an odd experience. I got a multi lifetime supply of deck screws, fill screws, and air hole screws for $14. The odd thing was the site didn't include mailing charges during the ordering process. It just said, applicable shipping will be added. I didn't find out how much they had charged me until I got the receipt by email a couple of days later. It was $6, which seems reasonable. Just never had that happen before.
I had taken some air hole screws out a while back to try to stop the whistling noise, and lost them. Didn't seem to help with the noise. But I was getting a bit of seepage from the air holes on the bottom. I got flat end air flow screws instead of the original cup ends and they don't whistle at all.
I got some seepage from the fill screws as well. The new screws have slightly larger heads and they are flatter on the underside too, and they don't leak at all.