That’s always the best way if you can. You might need to cut down an Allen key to fit in there!If you want to be a bit more controlled and not need three hands for the job...remove the clamp bolt, reverse it, screw in through the top, with something flat in the clamp slot. This will jack the clamp open and hold it there while you push the barrel section out.
All the best,
I always used an old 2p to put in the slot.That’s always the best way if you can. You might need to cut down an Allen key to fit in there!