That is the idle jet, Sparker. The tiny hole in the end, which is the calibrated part, is larger than 0.30 mm but smaller than 0.35 mm. On a genuine Honda it is 0.33 mm if I remember correctly, but on all the chondas I know of, it is in that 0.30-0.35 mm range. What you needed to do, was to clean it with carburetor cleaner. Now that you've hard-packed it, I can only see two choices. You can work gently on it with something the correct diameter (in other words, a 0.30 mm jet drill bit) or buy a new idle jet. If you decide to replace it, finish your carburetor overhaul first in case you find you need other bits as well. To get the parts you could go to ebay, or contact roebuck by PM.
http://www.ebay.com.au/itm/Fits-law...DefaultDomain_15&hash=item43da0df891http://www.ebay.com.au/itm/Fits-law...DefaultDomain_15&hash=item43da7dc960 
