Sonor AQX Bass drum leg extension

Sonor AQX 20 mm bass drum leg extension

I use them on my 18" bass drum with a 3d printed riser. 

They slide onto the existing leg.

Simply printed upside down with no supports and 0.2 mm layer height

Tap the inside thread :  I used an M10 tap (which doesn't fit the thread : it's probably imperial), and it locks itself into place because of the different thread pitch.

I polished mine to have a better look.