Norman has the right method. Solid silver steel pin. Needs to be nice fit but otherwise straightforward.
To close the OT drift on Spirol pins.
A UK retail source is :- **LINK** . An ordinary split tube roll pin is unsuitable for that sort of overhung application as it will crush and deform under any serious load. Doesn't help that most of the inexpensive import ones usually found retail are way, way weaker than the specification. Spirol form have inherent internal support.
Metric assortments can be got too :- **LINK**. Not cheap but I shall be saving up!
Clive