I haven't tried the squirrel buster yet, but someone here 
suggested a while ago making a feeding station for grackles, 
starlings, etcl, some distance away from the main feeders, and 
that helps a good deal.  Doesn't keep them all off all the time, 
but it reduces the piggy traffic by I'd say about 75 percent.  I 
put a sort of large flat platter with nice cheap cracked corn on 
the ground about 30 feet away, and it's heavily patronized by 
grackles, starlings and mourning doves.

Jane
Shoreham

Robert Lyons wrote:

> We are having difficulty lately with dozens of grackles hogging the feeders.
> Even changing over to safflower seed has not discouraged them at all. I seem
> to recall someone here speaking of the Duncraft squirrel buster plus feeder?
> Can anyone say if this feeder or another like it will help to discourage
> grackles? Thanks in advance.
> 
> rob
> 
>