Trevor is of course right, but I felt duty bound to offer the cheap bodge alternative solution as it may be of use at some other time.
They are also useful for tying ropes to to moor boats up to the jetty, being very strong etc etc.
I always thought split pins looked a bit chunky myself, although quite fitting for a vintage model. Personal opinion, and not a criticism .
Ashley Fences and gates!!
made me larf 