TMC Splicer Tool can be used for attaching thin leaders to fly fline. The tool has a small hole at the tip that fits lines under 0,20 mm diameter. With the tool you can pull the leader inside the fly line and attach it with nail knot. This way there is no additional joint caused by loop to loop connection and therefore it allows more beautiful presentation.
This product is available with or without the holder. Holder has groove for fly line to keep the flyline firmly in place while inserting the needle.
Check more detailed instructions from the picture above. Needle lenght about 2 cm, handle length 1,5 cm. Total length of the tool is about 4 cm.