US bombing of Iran's nuclear sites

[ionelv]

BBC has an article about the effectiveness of US bombing of Iran's nuclear sites. This sentence caught my eye:

Even so, the centrifuge machines, which spin at high speeds to enrich uranium, are highly sensitive which means the explosion will likely have crashed many of them by sending them spinning off their axis.

I wondered: would it have had the same effect if US simply dropped large boulders on those targets? Maybe Israel can build some large trebuchets or repurpose their David's Sling Into an offensive system and simply lob some "David stones" at those sites periodically?