[rant] As a side note, I'm wondering if this is an example of how the internet, social media, and self-publishing has contorted our designation of authoritative sources....I don't know who the OP's authority is, nor do I need to; however, I did cringe at the "typewriter god" description and have to wonder if this god is someone who actually worked in the typewriter industry, or is just an enthusiast like most of us here who became an influencer by way of self-promotion.

Dear Uwe: I'm very sorry your professional life has been overrun by self-annointed, internet-driven experts.  Speaking of the negativity made possible by the internet, let us consider, however, your own rant, which makes a startling number of assumptions about me (and my criteria for ascribing expertise) and about the interolcutor that I cited.  May I offer, perhaps, a more positive direction the conversation might have taken?

You: Dragon Typer, could you share more about why the basis on which you attribute expertise to the person who told you about the SG 3?

Me: Sure!  While I don't want to specifically name the person, since we were engaged in a private, face to face conversation that was not meant for broadcast on the internet, I don't mind telling you a few things about them.  They own and operate a brick and mortar typewriter repair in a major US city, where they have been located for the last 40 years.  They are one of the last fully trained typewriter repair people left.  Their business took a real dive when the personal computer appeared, but they managed to hang on and survive until the (internet-driven!) typewriter "revival" in the early 2000s.  Today, they run a brisk sales and repair business, and they are often consulted by other professionally trained repair people for advice on difficult problems.

You: Oh, wow, they certainly do sound like the genuine article, and not one of these internet-driven "influencers" that make me want to throw up in my mouth.

Me: I know, right?  I vet my information sources carefully, and their stature and training and expertise in the field is why I thought it would be worth asking about their comment on the SG 3 in this wonderful old-school forum, which is typically so free of the superfluous ranting you find on so many other social media forums.

You: How strange that they reported this mistaken information about this SG 3 right margin.

Me: Yes, it is strange.  But everyone has off days, and my takeaway is that even the typewriter gods can err from time to time.  No harm, no foul, and it's wonderful to have the updated and correct information made possible by this wonderful forum that you've created and maintained over the years, Uwe.

You: Yes, you're very welcome, and I'm glad the forum could be of use!

****
 

Dragon Typer, your point was well made and understood, thank you. However, in my defense I didn't actually accuse you of anything, nor did I assume that you blindly put your faith in an internet expert. I openly wondered what the situation was - nothing more - and I wasn't making any judgements about you.

Had you stated in your original post that you were speaking with the owner of a "brick and mortar typewriter" shop who has been in business for over 40 years, I wouldn't have wondered anything about who believed the SG-3 lacked a right margin stop. And I would have agreed with you that he had just made an uncharacteristic mistake.

To add more context to all of this, your sourcing of information about the Olympia is in my experience atypical; the more common thing that I come across is typewriter enthusiasts who get their information from authoritative-sounding bloggers, who themselves are examples of Alexander Pope's "a little learning is a dang'rous thing."

Amateur 'repairs' were the bane of typewriter engineers even fifty years ago.  Customers would bring a portable typewriter in, together with a matchbox containing screws and parts, and tell us that 'The kids had taken it apart' - yeh right   However, someone once pointed out to me that it was only the failed amateur repairs that I got to hear about.  The repairs that were successful didn't need any further attention and I would therefore not know about them,  So only seeing the failed fixes does tend to make you a bit cynical over the years.  However, I do stand by my remarks about 'armchair experts' !

People need to cool their heads on the internet a little here.  Yes, there is merit in the new wave of typewriter interest, and though it is not as "clean" as some of the older generations would like it, it is the best chance these machines have at surviving the next century.  Of course there will always be people who for one reason or another make a mistake in presenting information, I myself have fallen into that pit.  But we are all here to learn, and to be respectful.  

As to the original topic, I can 100% assure you the SG3 has a line lock, but I can see where your original source may have been confused.  The SG3 does NOT have a right margin stop, meaning that you can manipulate the carriage completely to the right without ever hitting a margin by means of the carriage release leaver.  The line lock, therefore, is the only means of encountering a "right margin," it will stop the action of the type at the appropriate moment.  It is a complex and finicky mechanism hidden behind the rear panel of the carriage.  It is this way due to the removability of the carriage from the machine, the easy-liberation means limited mechanical communication from the main base to the upper-carriage functions.  A hard drop or shock can knock things off kilter quite easily.  So yes, there is a line lock, but it is not easy to identify, especially since it is not very apparent.

You'd be surprised how many decently common machines a pro-tech might never come across.  In all the years I've worked, I have only had TWO Royal 10s on my bench, one of them was my own.  The best take away is simply not to judge, there is a reason and a story for everything.  And I know personally it can be hard, but nothing ever comes of it.

I will add an afterthought, the last thing any of us want is for this forum to read like a Facebook group!  This is a typewriter oasis