I have a old Horton crossbow, 150 lb draw weight, not sure of model. It came with a tiny single dot, red dot scope. I see no way to mount a normal scope rail or scope. It came with the dial adjustment, I assume for distances. How can I mount a normal rail and 4x32 scope on it ? Help please !! If you have a part number or link to one please post. Thank you. God bless.