Last night I read a thread where a member listed four things to look for when buying a pipe. For the life I me I do not know where the thread was or how to find it! One of the checks was to make sure a pipe cleaner would run down the stem and into the draft hole at the bottom of the bowl. One was to make sure that the draft hole met the bottom of the bowl. The other two I do not remember and cannot find! Since I am planning to add a pipe, I would really like to know what I should check! Thanks!