fmj, you're brilliant!
For the past several days, I've been wondering about the construction of a "bowling ball" mortar. - Trouble is:
<li>Where to find 8-1/2" pipe?</li>
<li>Cost/Availability of bowling balls</li>
Now, I can easily make some 6" <b>pycrete</b> balls and take advantage of this cold weather out here. - Thanks again, for bringing this up!