What ya do is get a battery operated drill and drill some holes in the overflows and put the gutter guard on it and get some zip ties from HD or Lowes and make sure theres NO metal parts in it ya want all plastic than just zip tie the gutter guard to the overflows, very easy and CHEAP fix and he will NOT get back in there, unless hes as small as a pencil!! I did it to my 2 overflows and NOTHING has got in there.