Originally Posted by barnakiel
If it is a small block then splice the shortened core
onto the dyneema, milk the sleeve forward and splice it onto the dyneema. Viz cored polyester onto wire.
That's my guess, not a hard fact.
+1 That is how I would do it if I was gonna do it. Except I Wouldnt do it. I think I wiuld install a smaller rope clutch
or use a cleat and stopper.
For a slight increase in Diameter Yiu can run a small line up the center of the line. Whose diameter you want to increase. But 3/16 to 1/2 Wouldnt work. At least I dont think it would but you might try it. The obvious advantage is external smoothness at the transition, especially if you taper your filler line, which ccould be the still good core from an old diuble braid line.
Maybe use a double braid, with the cover removed to make the small part?