Bird, I saw one about like that but they cut a narrow deep grove in each mating face lengthwise down the logs and put in a spline to lock the grooves together. This made an air and water tight joint and made up for any inconsistancies there might be or might develop over time in the mating surface fit of the logs.

[img]/forums/images/icons/smile.gif[/img] Pat [img]/forums/images/icons/smile.gif[/img]