By this point, you've already figured it out, but it can be useful to shine the light into the bowl and look into the shank to see where the hole actually is.Tried a few other items of various thickness with no luck. Even went down to fishing line to see if I could get it through. When I shine my headlight down the shank, it looks as if the shaft-hole to the bowl seems to be just a hair higher than the bottom of the shaft in the shank. The pipe cleaner goes to the bottom and passes by the hole. I've tried bending the tip of the cleaner slightly but to no avail.