Where can I get some novelties?

Hint 1 of 17:

There's a place just for this purpose.

Hint 2 of 17:

It's the novelty "shop" on the docks in Ankh-Morpork.

Hint 3 of 17:

Although you can't get inside, the wall is kind of thin.

Hint 4 of 17:

All you need is something to knock it down.

Hint 5 of 17:

You still need a fair amount of force, though.

Hint 6 of 17:

Find something pretty heavy.

Hint 7 of 17:

Like a weight.

Hint 8 of 17:

There's a one ton weight in Holy Wood.

Hint 9 of 17:

And if you look at the docks, there's a way of getting the leverage you need
to use the weight on the wall.

Hint 10 of 17:

You can hang it from the hook on the docks, and then use the weight to knock
down the wall.

Hint 11 of 17:

Too bad it's not quite heavy enough.

Hint 12 of 17:

You can make it heavier.

Hint 13 of 17:

How did you know it was 1 ton?

Hint 14 of 17:

Because the weight said so.

Hint 15 of 17:

Maybe you could make it say something else.

Hint 16 of 17:

Find another number to put on the weight.

Hint 17 of 17:

The mailbox in Holy Wood has the number 10 on it.