The handle fixing system with the Corby bolts is a very interesting system in the world of knife makers but not only.
It is a threaded pin with two diameters that allows a mechanical fixation of the cheeks that however must be glued and then the screw cuts on the pins are eliminated during the processing of the handle and the finished handle looks as if you used simple pins but in fact you made a mechanical tightening not only a planting as in the case of the pin.
Usually the inner diameter is 4 mm in diameter, and the outer diameter is 6 mm in diameter, but there are also 8 mm versions of external diameter although I think they are a bit large but it is a personal taste.
As you can see the price for each piece is 3-4 euros, so much or little is relative but compared to the pins is a much higher cost.
Personally it is one of the systems that I prefer because it allows you to obtain an excellent level of centering and tightness of the handle that must still be glued but allows you to have a level of tightness of the handle higher than the simple pin.
These of the following image are custom versions handmade with a lathe by a gentleman who did me the courtesy, I did not make the key cut that I do before assembly but are on the market and in the sites for makers.
To mount this type of pin you need two drill tips of diameter 4.6 and 6.4 mm or a step tip of 6/4 mm or diameter 8/4 mm
There are also other possibilities to make the two punctures but the important thing is to leave material for the support and the pull of the pin and have a depth that allows you to avoid once removed the key cut not to have to raise too much material because the risk is to see the thread and as a result you have to start over.
Below you will find a section where you see the schematic assembly, the maximum length is 24mm and not 29mm but it does not change anything it is just a version that I got made.
Personally the corby bolt I find it a very interesting handle fixing system that allows you to tighten the handle even more objectively than the pin and leaves an aesthetic finish of the handle as if it is a simple pin.
An added value that you can give to your creations.
I do not recommend using it without also using the two-component glue for fixing the handle.
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