Iīve been using the standard type BD riser (Gibraltar or Dixon) on my 18" and recently I noticed that it did some harm to the hoop:
Furthermore I wanted to test different kinds of heads on the BD and looked for a way to avoid repeatedly installing an disinstalling the riser.
I found the "Art Dixson Lift" on the internet and think the basic concept is convincing (watch the videos on his page):
no damage to the hoop and easy installing
Itīs just an expensive peace of plastic (about 40 $) and most of all - itīs not adjustable to height or diameter of the BD.
So I retreated to my basement workshop and made my own lift:
In that state I found out that the heel end of the pedal tended to slightly raise due to the weight of the BD and decided to add a support at the front end:
Now it should work fine - what do you think?