i have a bitzenburger fletcher and have always fletched right helical three feathers. i want to try four feaathers but do not know how to set nock reciever to do this. it has always been set for three fletch. any help will be greatly appreciated

There are three allen head screws on the nock receiver. Loosen the three fletch screw and tighten the four fletch screw.

thank you very much.

yeah.. there are 3 screws at the base where you turn the nock receiver.. one will say 3 x 120.. 4 x 90.. and 4 x 75 105 or something like that.. you want to loosen the 3 x 120.. and tighten the 4 x 90.