i always bring 1or 2 new stock birds in to try out against my own, i let my older stock birds go even proven breeders as i have sons and daughters at stock, sent 2 pairs up scotland last year that bred 1st Ayrshire fed plus several 1st clubs.
standard sputniks arent permitted why ? i have always used one with pad inside on the base birds are not clocked untill thay enter and can not get back out.