From Volume 5 - Issue #1 issue of RodMaker magazine:
The next time a customer asks you to restore the fit to his old fishing
rod with metal ferrules, don't turn the job down. There is an easy
way to do it and it does not require removal or replacement of the
ferrule/s in order to put the rod back into service.
A small tubing cutter fitted with a very dulled cutter can be
used to make a very slight circular crimp in the female ferrule.
I normally make on revolution near the top and one near the bottom.
On longer ferrules I make three - adding an extra in the middle.
Use very little tension on your first revolution and check for fit.
If it is still loose, you can add a bit more tension and make
another revolution. Normally it takes very little to restore a good
You don't want to cut the ferrule, so it is important that your
cutterhead is not sharp. I dull mine with a file and then polish
with some fine emery cloth. I have heard of others replacing the
cutter altogether and using a router head bearing in place of the
cutter. This gives a wider crimp than the supplied cutter.
Small tubing cutters can be purchased at most any home supply or
hardware store for less than $15. Very worthwhile if you do much
repair work that deals with metal ferrules.
~ Chuck Ritchey
If you have any tips or techniques, send them
along! Help out your fellow rodmakers!
~ Publisher, FAOL