With respect to your spools, the side you show in the photo should go face down and the "v" cut side should face up. If you don't have one you can find a manual at https://site.xavier.edu/polt/typewriters/RoyalKHM.pdf The Royal standards from the X onward are broadly the same so manuals for the X, KH, KHM, KMM, KMG, HH, FP, Empress, and FP should all be useful too: https://site.xavier.edu/polt/typewriters/tw-manuals.html

Royal Strengthen Shift Springs KMM Typewriter by [[Phoenix Typewriter]]

I picked this up from a repair manual, but good to see my reading was correct.

Forming the tabs on the shift assembly inwards will increase the tension and responsiveness of the shift assembly on older Royal standard typewriters.

Royal KMG KMM Typewriter Shift Motion Alignment Balance Upper Lower Case Adjustment Repair by [[Phoenix Typewriter]]

Royal Typewriter KMG Mainspring Drawband Tightened Adjusted Tension by [[Phoenix Typewriter]]

On the left rear corner underneath the carriage when moved to the right, one can easily see the mainspring and drawband assembly. Just behind it is a worm drive operated by a screw. Turning this screw counterclockwise will advance the worm drive to the left and increase the tension on the mainspring.

I just got a 1950 version of this KMG this week in medium rough shape too. (My 7th Royal and my 2nd Standard)

Looks like a Royal KMG with the Henry Dreyfuss glass tombstone keys in Gray Frieze paint. https://typewriterdatabase.com/Royal.KMG.72.bmys

Mine has some minor carriage issues that I'm hoping clear up with some cleaning. Otherwise it may need some tools and internal repair work and/or parts. If yours is generally working, a good cleaning and oiling should get you going: https://boffosocko.com/2024/08/09/on-colloquial-advice-for-degreasing-cleaning-and-oiling-manual-typewriters/

Diagram of parts: https://site.xavier.edu/polt/typewriters/RoyalKMGdiagram.jpg

Manual of the prior model KMM which preceeded it, so the functionalilty should be almost exactly the same: https://site.xavier.edu/polt/typewriters/RoyalKMM.pdf (Royal Standard internals were almost exactly the same from the Ten (1909) through the FP/Empress (1966).)

Home Study Course in Typewriter Repair and Service: ca. 1959, published by the Typewriter Repair School in Little Falls, New Jersey. Focuses on the Royal KMM among others: https://site.xavier.edu/polt/typewriters/homestudycourse.pdf

See also:<br /> - https://typewriterdatabase.com/manuals.php - https://typewriterdatabase.com/1968-Ames_Standard_SVC.royal-repair.manual - https://typewriterdatabase.com/1960-Ames_Gen_Cat_10-March.royal-parts-01.manual

Searching on YouTube for cleaning and repair advice should help out a lot. Phoenix Typewriter has some solid videos on related models (search also the Royal X (ten), KH, KHM, KMM, KMG, HH, FP, and Empress which are all roughly the same internals with slightly different body styles.)

If you need some basic typewriter 101, try: https://www.youtube.com/playlist?list=PLJtHauPh529XYHI5QNj5w9PUdi89pOXsS

reply to u/MajesticWear5478 https://old.reddit.com/r/typewriters/comments/1g1i440/tips_for_cleaning_and_fixing_a_1949_royal/#lightbox

The Royal Ten (and later standard typewriters in the line) have a mechanism such that when the carriage is advanced it causes the ribbon to advance simultaneously. Sometimes this mechanism can be gummed up with oil causing issues with ribbon advance. Hitting it with lacquer thinner and/or Nu-trol can free this up.