I've done a few of these now and Randy Dorcy has reeally put them to the test.
Using a Penn 10-49 stand to add provisions for a clamp.
One spacer for each side of the clamp. The side plates and rings are drilled to 1/8" and then counterbored for using larger 5-40 stainless screws.
(https://i.imgur.com/Drqvsdn.jpg)
(https://i.imgur.com/Umeq59d.jpg)
(https://i.imgur.com/pvKWr0x.jpg)