Help on level 'Bowling Alley'?

I'm stuck on level 'Bowling Alley'. What I can't figure out is how to get the bowling ball to slide over and go down the ramp to hit the pin. I've tried to make the baseball hit it via the trampoline, but there's not enough force (which makes sense), and I don't know how to get the really large sphere suspended by a chain to swing free to hit the bowling ball either. Any hints?

Thanks!

...nevermind!! Have got it now :-)