Given the vastness of the wisdom on this thread & its mixed amongst all our banter simultaneously, I've spent some time scanning back thru the thread for: details, pics, name & part #'s & websites.
Found these sites:
Alamo/Mott Flail Montage Enterprises
Alamo Models Parts Listings & I went to these two:
Alamo AC6� (May-91) Parts Diagrams
Alamo Brahma 6� Archive (Jan-96) Parts Diagrams
Clean Cutter Tiller Blades
TractorJoe
and even though they are supposedly closed down since November of 2019 their info is still up and PDF catalogue still available
http://flailmaster.com/our-products/
Regarding the advice that the Ford 917 model can use some/certain Alamo/Mott flail blades I couldn't figure out how to scan-search for what will swap in "plug n play" style?
Thanks to @TheFarmerInAdell for posting the picture in post #6576 that is from the Flailmaster PDF. The bottom of page 23 for the Ford 917 specific blades/hangers etal.
If you look at the top of page 2 on the Flailmaster PDF for the Alamo/Mott blades there is the "fine cut" model #MH-386. Is there any data that anyone has showing/proving (past experience?) these are too long to try and use in the Ford 917?
If you look at this page from clean cutter in California, it gives the size & measurements of the blades that match the pictures and measurements of the craigslist ad I am referencing below.
http://www.cleancutter.com/CL102086.htm
As a comparison from the Messicks PDF for the Alamo/Mott mowers [Model # AC60 and the AC60 Brahma from the archive] have the same looking blade but, the measurements are not something I have found yet..
I ran across someone on craigslist selling off a bunch of them... IIRC they have about 155-ish blades left. They measured them and said each "almost L shaped" blade is 1 1/4" wide, about 5" tall, is sharpened on both sides & is stamped with MOTT.
That would mean I'd still have to find & buy a bunch of the hangers, clips, as well as a bunch of bolts & nuts to mount them.
The hangers via Messicks are almost $6 each & the Blades are $5-8+ each.
Bolts & nuts are solved via the bigbox store given their size is 3/8" X 1"(OR 1 1/4") 16 thread pitch Grade 5 full threads from the Messicks PDF.
That being said. To clarify, recap and finish my post.
How would I figure out if these "Mott stamped blades" on craigslist are too long for the Ford 917 mower?
Is there a needed distance for flow of the cut up debre/mulched grass/etc as well as the tip of the blades minimum distance to the rounded shell of the housing that the 3-point arms are bolted to?
If so how much and where should I try measuring? (There, I hope the focus was better this time and the dyslexia doesn't byte me this time)