Fast 1-2 holes with tb

david, 

how Are ya? :)

my question, this time, is about licks involving holes 1 and 2 

while the 2 in bent whole step - something like born in Chicago. 

It seems impossible to me to switch side of the tongue and be efficient so I try

to pucker the 1 and tb the ”2. 

But it is very difficult. 

I manage to pucker everything but but that would miss the point. 

also, sound of note is nice and full but articulation on bent “2 sound muffled. 

any tips?

thanks