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My Cadet has struts on the horizontal stabilizer, I would have to pull the logbook to give you the exact wording but I remember it being something like, "installed horizontal stabilizer supports as per work order number...." 
I assumed that it was referencing another aircraft that had these struts installed but the documentation was spotty so I really don't know.  They could be easily removed but I see no reason to after all these years.

I have 6 pages of "Operating & Maintenance Instructions for the MA-3A  p/n A10-2302 as part of my 4AC-199 Maintenance & parts book.

The 6 pages include an illustrated parts breakdown... but no data plate..  For me the answer is - no data plate on these early carbs...  the p/n should be stanped into it probably on the lower flange where the air box bolts on.

This is all in the Franklin manual that Bill P. copied elsewhere on this site.
P.R.

Hi Paul,
Thanks for this feedback.  After much discussion, this is what was determined during the annual.  I was very happy to hear this as I really don't like messing with something that isn't broken!
-Joe

Hi Craig,
It would be interesting to know how many are out there, as projects and/or flying.  I have wondered this myself
I can tell you that my Cadet has been a lot of fun, I spent about 60-70 hours in it last year.  Haven't spent much time at the airport this year (our new 4 month old has my attention right now).
Best Regards,
Joe

Thanks for sharing this Mark.  I thought of contacting him many times but now regret that I did not take the opportunity.
The comments about him online indicate he was a great man, loved by his friends and family.  No doubt he will be missed!

How proud do you think daddy is?
Very!

She'll be ready to solo in no time!

From what I can find the appropriate Marvel-Schebler part number for installation on any Franklin 4AC-199 90 H.P. engine is A10-2302.  I found this in a "Service Parts List Model MA-3A as used on Franklin Aircraft Engines" attached to a copy of a Franklin 4AC-199 Operators Handbook & Parts Catalog.

Hi Brett,
I found that a few hours after posting, just got home and see you came up with the same.
Thanks for you feedback on this.
Best Regards,
Joe

This is a very generous offer.
You may want to get in contact with Ron Alexander of PeachState Aerodrome.  The museum is 501c and with the recent construction of an additional hangar, there may just be a spot for it!  Its a great little airstrip with a nice restaurant and the museum.  The Veterans day fly-in there is one of my favorites!  Always draws a really nice crowd of pilots and locals every year

http://www.peachstateaero.com/museum/
You can contact Ron Alexander at 770-467-9490 or ronalexander@mindspring.com.

Best Regards,
Joe