Stick assembly is the key thing.

You're not going to find a thread strong enough to pull a few tonnes of stone, but you can easily pull it with a large number of ropes pulled by a few hundred people.

Similarly, a single 8x8 beam as a lever arm would just snap, but a dozen 8x8 beams as lever arms for a dozen levers probably wouldn't.

Here you go.

I'm not saying those are the exact techniques that were used to build the pyramids, but they demonstrate that massive stones can be easily lifted and accurately placed using only "primitive" resources and leverage.

There is no guarantee that the lever would break in any position as particular as the pivot point.