In this project I would like to highlight the making of koiguchi of the copper band type. This style of koiguchi provides substantial strength to saya anad allows considerable flexability in the manufacture of koshirae around selected kodogu.
This photo shows the koiguchi of the saya prior to the fitting of koiguchi. The opening is still in its rough form and has yet to be fitted with the tsuka and respective seppa.
A piece of copper is selected
One edge is filed flat
Shears are used to cut a band of copper from the stock
The band is flattened
Paper is used as "oshigata" for determining the lenght of the band
The lenghth is transferred to the band
The band is cut to lenght
Preliminary form is set
The edged is prepped and soldered
The seam is cleaned inside and out
The edge is then filed Flat in preperation for application to the saya
The saya is marked for stock removal
The depth is cut using kebiki
I like dozuki for inititial cuts but care must be excercised!
Nomi is now used for stock removal
The saya is ready for fitting
The band is gently adjusted with genno and contact with saya is adjusted by continous removal of stock
The ana is plugged and yasuri used to bring the band to an acceptable height and flatness.
Yasuri is now used for bringing the band to an acceptable level for nuri
Notice that this style of koiguchi allows a considerable amount of stock to remain on the saya while still being quite thick, making it the koiguchi of choice for practioners of martial arts