Harbor Freight Grinder Stand Stabilizer

I ordered a grinder stand from Harbor Freight. Unfortunately when it arrived it didn't go together as well as planned.

The top casting has a tapered hole that fits over the vertical tube. Two problems prevent this casting from staying level when assembled:

1. The top of the tube does not rest against a flat surface. Perhaps it is _intended_ to, but due to the quality of the casting it cannot.

2. The tube sits in a tapered hole, with a single bolt to secure it. This forced the tube to an