Part of the japanese katana--Seppa
Seppa is basically a pair of identical "spacers" or "washers" used to firmly fill any gaps between the tsuba (hand guard) and the handle assembly. Katana Seppa is considered an important Japanese sword accessory because it acts as a shock absorber when the sword comes into contact with the target.
The use of this part ensures the good coordination of habaki, blade and tsuka. Seppa can also separate the blade from the protective gear. These are usually made of copper or brass and appear in pairs, usually one millimeter in thickness.
They come in a variety of styles and materials, from the more refined example shown above to the standard brass "cog" style common on production swords (mass-produced katana).
In addition, when installing a new but thinner than the original tsuba (hand guard) novice, you can use the other hand to get the best fit, although many people prefer to use dental floss or dental floss or even homemade To fill any gaps between teeth, aluminum invisible gaskets.
Seppa's ingredients, cost and Common Problems
What are they made of: Seppa is usually made of copper or brass because this material is soft enough to cushion any impact without damaging or scratching other components, but it can also be made of silver or even leather (although Leather is relatively rare).
Frequently Common Problems: The most common problem with gaskets is that they arrive or become slightly loose and swing under the component.
This is usually caused by imperfect fit due to the "one size fits everyone" method. For nagako (tang), the hole is too large or too small
To adjust for an imperfect fit, a common technique is to use a small punch to slightly squeeze the diaphragm and/or file the material into a file to create a custom fit. Due to the time constraints at the forge where the sword is made, This coordination is not feasible.
As mentioned earlier, an additional gasket can be used to fill the gap created when the tsuba (hand guard) is replaced with a thinner gasket.
I hope the information about Seppa is helpful to you.