Loose finbox repair help

Discussion in 'Surfboards and Surfboard Design' started by Kahuna Kai, Oct 17, 2015.

  1. Kahuna Kai

    Kahuna Kai Well-Known Member

    Dec 13, 2010
    Just picked up a sweet new longboard on Craigslist and just realized why I got such a good price. The fin box is loose causing the fun to wiggle side to side. I have a shim in the box to help, but it's not tight enough. Any suggestions for tightening up my situation?
  2. Mitchell

    Mitchell Well-Known Member

    Jan 5, 2009
    without seeing the board its hard to say. If the fin box is wiggling (box is loose in the board, not just fin is loose in the box), and there is enough of a gap to shim it, then you might be able to inject some resin down the gaps. I use large gauge syringes for this kind of project and warm up the resin to get it as runny as possible or it just wont flow out the syringe tip. It is a messy and time consuming project. Use less catalyst than normal because warmed resin kicks faster. Epoxy resin tends to be thicker than poly so it might not even flow out the syringe at all...never tried epoxy.

    There's always the remove and replace option, which is worth doing it its a nice board, because if the fin is wigging enough to shim, then water will probably find its way in, and rot out the board from the inside under the box.
    Last edited: Oct 17, 2015

  3. kidrock

    kidrock Well-Known Member

    Aug 1, 2010
    Leave the box alone, and add a BLEF finne. Should work like magic in cold water
  4. chicharronne

    chicharronne Well-Known Member

    Jun 22, 2006
    It's, no fin to have your fun wiggling side to side
  5. Mr.Belmar

    Mr.Belmar Well-Known Member

    Aug 19, 2010
    Yup- if it's the loose where the box is installed in the board- then it's ng and either try this^^^^

    Or take it somewhere and have them put in a new box.

    IF it's just your fin being loose in the box- and the box doesn't move, then you can shim the fin with something- I usually use layers of packaging tape and cut to size and stick on the sides /wrap around bottom of the fun base.

    Btw that really stinks. Make sure to take care of it unless it's a junk board. I would opt for replacement of its a nice board.
  6. waterbaby

    waterbaby Well-Known Member

    Oct 1, 2012
    Did you try any other fins in the box to see if any are snug?...someone may have sanded the base of the loose fin.

    If that doesn't work, it may mean the board's previous owner sanded down the walls inside the box. Not much you can do about that...other than shim...or replace the box.
  7. DawnPatrol321

    DawnPatrol321 Well-Known Member

    Mar 6, 2012
    Bummer dude, go take a dump on the hood of that dudes car
  8. Kahuna Kai

    Kahuna Kai Well-Known Member

    Dec 13, 2010
    Shimmed it with some duct tape and that did the trick. Thanks for the feedback. It really isn't fun having a wiggly fin. Driving over to crap on dudes hood now.
  9. Kahuna Kai

    Kahuna Kai Well-Known Member

    Dec 13, 2010
    Trimmed the tape to cover only the top of the sides of the box so the fin could still slide. Tight like a sausage casing.
  10. DawnPatrol321

    DawnPatrol321 Well-Known Member

    Mar 6, 2012
    Good work dude, eat some Taco Bell for best results on the hood ornament.