In the past, this is what I did.
I cut one anther from the flower. With a razorblade, I cut a small bit of the tip of that anther, I hold it over a wax paper with a forcep and then I put the tuning fork on the forcep. If there's pollen, it will drops on the paper wax. I'll then remove the other anthers and do the same. If there isn't pollen, I'll wait another day before trying with another anther. The pollen will be use on a new flower. The pistil of the first flower is usually not receptive anymore at the time the pollen is ready.
Good luck