We`re thinking of doing the same, but it seems very tricky getting fixings for a fat aframe! So instead, we`re going to buy the black plastic rodholders, and then put 2 stainless rubber coated `p` clips top and bottom so they are a tight fit, and then put another 2 on the aframe, then 2 bolts through all 4 clip holes. When tightened, there shouldn`t be much movement. Need to do something, already lost a good bass rod this year!
Politicians, like nappies, have to be changed frequently - and for the very same reason.