Which 3.5" flexible backing plate for DA would be considered best?
Also, while on the same subject, some of the designs make me wonder how flexible they are to start with, if any at all?
I mean when I see design like this
wouldn't top plate with 3 "rivets" (?) actually result in stiff(er) plate than a design that would be more along of something like these (yes, I know second one is not 3.5", and third one is for rotary, I am using it to just illustrate kind of design)
?
Thank you in advance for your input and Happy Thanksgiving!
Also, while on the same subject, some of the designs make me wonder how flexible they are to start with, if any at all?
I mean when I see design like this

wouldn't top plate with 3 "rivets" (?) actually result in stiff(er) plate than a design that would be more along of something like these (yes, I know second one is not 3.5", and third one is for rotary, I am using it to just illustrate kind of design)
?
Thank you in advance for your input and Happy Thanksgiving!