Small update.
The wood top still hasn't arrived, late as usual since it's USPS.
Had two customer orders to knock out so I added making the metal top for mounting the lead screw to, as well as a sort of mock-up template for how I want to mount the backrest.
For starters, the t-nuts arrived. I opted for M8 versus 1/4 -20 because I wanted something stronger, not to mention I have a ton of grade 8.8 and grade 10 metric hardware on hand.
Might catch some flack for this but I also got some wrinkle finish spray paint for the stool. Yes I know some of you mentioned powder coat but I'm poor unless y'all want to throw some funds my way
Here's the metal top. I'm going to use 5 t-nuts for the wood top to fix to the metal mount, and I added the hole in the center for centering over the wood piece. The metal mount will serve as a template for drilling into the wood too.
As for the piece I'm holding here in my left hand, it's a mock-up mount for the backrest.
I could use anywhere from 4 to 6 t-nuts and attach this to the underside of the wood mount. The question that comes to play is how far out would I need the mount to come out before I bend it upwards for mounting the backrest.
A follow-up question to that would be, if I should buy some 1/8" steel for the backrest. Using 3/16" has been way overkill but it's definitely not cheap.
On top of that, I'll need to grind down the nuts to weld them into the center tube and only after everything is done, can I finally cut down the lead screw for my desired sit height.
@sqznby I didn't forget about you!
I'd rather just have all parts and measurements figured out before I made anything for anyone.
That and the thread (as well as what I'm using) can help you plan ahead.
I'll have a ton of extra t-nuts by the way since I only need a handful of them unless you're going with a pre-made stool top.