I have an SG and when changing strings I always leave one string on until Iāve finished cleaning the guitar.
The first time I changed strings the tailpiece fell off. Fortunately no damage.
With the traditional style tailpiece you also have to be careful not to move the hight adjustment wheels with your cleaning cloth.
Congratulations! Itās a very nice guitar, I like the simplicity of the design and the coil-split option is a cool feature. Iāve never really been aware of Guild as a brand, so I was surprised to find out that Pete Cosey played a Guild S-100 on the concerts recorded for Milesā Agharta and Pagaea albums which are pretty much at the top of my top albums list. Judging by images, that model looked quite similar to yours, though Iām not sure if the pickups and electronics were identical.
As for the stopbar tailpiece, Iāve got an Epiphone Les Paul whose stopbar doesnāt fall off without strings on because it has 2 small clamps (for want of a better word) that sort of clip it to the two adjustment wheels, just lightly enough to keep it in place. Itās very easy to remove it for cleaning and then to put it back in place. I was quite surprised when I changed strings on my Epiphone EB3 bass and the tailpiece fell off when I turned the bass around without the strings on. Another lesson learnedā¦
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Thatās the one Iāve got my eye on 
. Although there will be no new guitars in my near term future, I think, and Iāll need to try it (and a bunch of others) first.
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Yes, JĆ³zsef, Pete Cosey plays Guild S-100. Probably the best known guitarist using this model is Kim Thayil form Soundgarden. His signature guitar cost in Europe 1050 $ made in Indonesia, and 8300 $ made in USA. My one was 800 $, has different pickups, and does NOT have phase switch.
So far, after 5 days, I can say itās amazingā¦ 
By coincidence I was browsing guitars on Facebook marketplace and saw a DeArmond M-35C with similar.
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Yes, this stop bar and pot knobs look almost identical.
I knew that DeArmond is pickups manufacturer, but I had no idea they also produce guitars.