i canna understand your post peter saying the birds went over a fence and hit a van. my doos are open hole and are off like a gunshot many a time and never hit a thing except me if ime in the way, i dinna agree with this lock down for a fortnight after vacs, as long as its done 2weeks afore racin then no need to hold them in , let out an keep them smart thats my way, aye you lose some but they are switced on for bop an thats what you want when trng starts, dont confine doos is what i say peter.