Craig...
Thanks for the correction. I got caught off guard on that one. I asked Jeff if these were "standard" couplers, and he said "yes". I think he meant standard for the WP&Y.
We had to deal with similar problems on Hal Wilmunder's projects. The Westside lumber Company used 3/4 size couplers, while stuff from elsewhere was standard size. That hassle should have made me more perceptive on this.
I've been pleased to see your site, which I hadn't found until your comments on my first post. You've done a fine design job.
Cheers, Bob Keller