While making the 46 ratlines from the 0.25 mm wire with 2x2 stitches for the eye splices, you have to do something else every now and then.
The forestay made to size.
The example:

At the top (1), it is attached to the mast with an eye splice.
At the bottom, it is attached to the upper metal 4-sheave block with an eye splice and metal eye.
On the 1:1 Balder, a rubber shoe has been fitted around the stay at the bottom (2). The 10 rings of the jib are caught over this. Presumably to prevent chafing and to ensure the eyes do not get caught on anything.
The forestay is made of 0.8 mm rope. That is thick enough to make a proper eye splice:

1: I have temporarily secured the folded end with a thin thread. You thread the middle loose strand through a fixed strand first. This is how you start by getting the 3 strands each at 120 degrees.
2: The next step is to thread each of the 3 strands diagonally from right to left over a fixed strand and then under the adjacent strand. After all 3 strands, you will have them each at 120 degrees again.
3: I use a small sail needle to thread through. It is triangular and has a slightly blunted tip, which makes threading easier. It also has a somewhat larger eye so that you can easily get the loose strand into it.
After each threading, pull all 3 loose strands a little tight and, if necessary, roll them between your fingers so that they lie neatly in place. Then repeat this until your splice has the desired length.
The result:

1: The eye splice for around the mast.
2: A test to replicate the original using thin heat shrink tubing. But that is too coarse for me, and the 2.5 mm eyes for the jib do not fit over it.
3: Opted for a served splice where I shortened the 3 strands in 3 steps to varying spacing. First, I slid the 10 rings over the eye and then inserted the metal eye.
On my temporary setup:

On the left, the eye splice around the mast, and on the right, the served splice with the metal eye around the pin on the metal 4-sheave block.
Regards, Peter