STephen wrote:

I see that that the recess in the stringer is actually shaped so that
the wedges can be inserted.

It looks to me like the vertical wedge is what holds the riser up. Is
that right?

Yup, well it helps - it ought to be fixed to the back of the tread below
as well, and partly held by the arris blocks at the top.



--
Cheers,

John.

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