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Some of the light guides are too narrow and the clamps start moving before the light turns on. For those fibers I should try putting a little paper or piece of lint-free cloth on the bottom gripping clamp. It should not get between the clamps because then it would keep the ferrules apart. It should be at the end of the clamps farthest from the ferrules so that if it does keep the clamps from closing completely maybe the ferrules will still be in sufficient contact.
Some of the light guides are too narrow and the clamps start moving before the light turns on. For those fibers I should try putting a little paper or piece of lint-free cloth on the bottom gripping clamp. It should not get between the clamps because then it would keep the ferrules apart. It should be at the end of the clamps farthest from the ferrules so that if it does keep the clamps from closing completely maybe the ferrules will still be in sufficient contact.
Today I tried paper and lint-free cloth as methods of enhancing the grip of the ferrules on the fibers. I tried a small strip of paper, a larger piece folded into a v shape, a large piece wrapped around the long fiber, a small strip of lint-free cloth, and a larger strip of lint-free cloth that would have extended between the clamp surfaces that are supposed to be in contact.
The paper wrapped around the fiber prevented the clamps from moving at all except when I pushed hard enough to make them move suddenly. Sudden motion is not acceptable. The clamps should move steadily and gradually as the heating light is on. With the paper I got fuses that broke at 850 grams. When I switched to lint-free cloth, some of the fuses held 850 grams. However, the clamps still moved to the right spontaneously during some fusing attempts.