that worked for you i had nest boxes that you could remove the partion and replace with perspex so the birds in each box could see each other and i would move the nest bowls togethere won lots of pools with that one but the ones that stick in my mind was a barren hen i had years ago i had timed two or three times slipping eggs under her but forgot to take the dummy eggs out and had nothing i fancied for hastings that year the hen was in good nick but had been sitting 38 days on dummys so i thought id put a wee youngster under her but the youngest i had in the loft was 14 days old far to big then i rememberd there was a blackbirds nest behind the loft there was 4 yb and an egg the the yb were about three days old so i took one and taped its beak shut and put it under the hen she was 1st club 18th sect 28th open fed 380 miles 3500 birds and all pools the wee blackie was put back and fleged weeks later another was a yrl cheq cock that loved sitting eggs he was sitting a pair and i slipped another under him making three and he was fine but when i added a forth he was very agitated as no matter what he did there was always one sticking out he would push one in at the front and one popped out the back push in the one at the back and one came out the front i let him do this for one hour before basketting he was 1st club 4th sect 12 open maidstone winning 780 pounds what worked for you tell us