A method for mounting an optical fiber within a tube in which the optical fiber is positioned through the tube so that a portion of the fiber protrudes outwardly from the distal end of the tube. A curable material, such as an adhesive, is then applied to the optical fiber portion which, upon curing, forms a flexible solid material having the refractive index less than refractive index of cladding material of said fiber optic. The outwardly protruding portion of the fiber is then retracted back into the tube so that the flexible solid material isolates the fiber portion from the tube. In addition, different clamping assemblies are provided for attaching protective sheathing for the optic fiber to a mount for the optic fiber which permit easy disassembly and removal.