Try using an old Outters cleaning rod and .22 bore brush. Attach it to a drill motor and whittle away at it. Use Hopps #9 to pour into the hole. Use the drill motor on a very low speed.
Try using an old Outters cleaning rod and .22 bore brush. Attach it to a drill motor and whittle away at it. Use Hopps #9 to pour into the hole. Use the drill motor on a very low speed.