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A careless movement when unloading, a sudden gust or a crash with stones on the shore: if there is a hole in the laminate, water will quickly penetrate the board. To save the session, a repair stick (such as the that of M2) in your luggage. You can cut off a piece of this and mix the hardener and filler by kneading. The compound then only needs to be pressed onto the damaged area, and after a short curing time you can get back on the water!
A good addition to this are the Repair kits from Solarez. These harden well even at low temperatures, all you need is a little sun. Also available for neoprene!
Can do everything, is always needed: whether for quickly patching small tears in sails or neoprene, for fixing plasters and bandages or countless other applications: Duct tape belongs in every surfer's car!
The classic: a loud bang when trimming the luff and the old rope is torn. Replacement ropes of the right thickness should always be included for such cases. Ideally, of course, you should not only discover worn-out areas when it is too late, but replace the ropes beforehand. A regular check is therefore mandatory, including for the ropes on the outhaul and the front piece of the boom. After all, a torn rope during rigging is annoying, and a tear on the water can lead to a long swim or, in the worst case, to a call-out by the sea rescue service! In such cases, a sufficiently long piece should always be carried on the water, for example on the harness hook.
Small but essential: If you lose your fin screw, you can forget the session - at least with the optimally selected material. The same applies to the small plate that is screwed into the box on US box fins. Such small parts are quickly lost in the grass or sand. Replacements should therefore be in your surf bag or car - and usually fit other boards too.
Banal, but important: a little Emery paper (not too coarse-grained) is very helpful for quickly sanding smaller quirks on the fin. Even if the board has a quirk and Dr Ding is to be used, the area can be prepared with a little sandpaper.
If you use RDM masts, you will need an adapter for the front piece on most booms. With many manufacturers (e.g. GunSails), this can be clicked in securely. However, if you switch between RDM and SDM or the adapter is not firmly attached to the front piece, it can get lost. A standard adapter (e.g. from Ascan), which fits all booms and "simulates" an SDM mast, can save the session in such cases.
Even without do-it-yourself ambitions, a Screwdriver for windsurfing: A suitable tool is required at least for attaching the fin. A screwdriver is also required to move loops and can also be used as a trimming aid. And when it comes to assembling a foil, many even reach for the battery-powered version. Phillips screws are the most common, but some manufacturers also use Torx or Allen screws.
Over time, harness lines can also wear through, or the attachments on the boom can slowly wear out during assembly and disassembly. A pair of spare ropes is therefore advisable. Make sure they are the right length!
Many extensions have a uniform ring on which the safety pin dangles with a thin thread. During assembly and disassembly, the top of the ring can slip off and get lost in the sand or on the grass. If you have such an extension, you can pack a spare ring to be on the safe side.
Not essential for everyone, but if you are travelling on the Baltic Sea or in the south of France, there is no getting around a weed fin. It is therefore advisable to have a suitable fin in your luggage. Even if you have to make compromises in terms of riding characteristics, you will always be faster than with tufts of weed on the slalom spine. There are now also numerous seaweed fins for multifin boards in the wave sector.

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