My SF DeLuxe does that exact same thing and I choose to not use Shift Lock. I found the reason to be actual flexibility and incredibly small amounts of play in the various moving points of the mechanism from the Shift Key all the way back to the segment. I have that Lock button adjusted as well as it can be and I still have an error in what I get in line spacing from a normal use of the Shift key and Shift Lock. I've resigned myself to living with the issue.

Phil Forrest

Thanks, Lau, I was imagining a similar solution. Removing that plate, and putting it back on -- with the addition of a screw between the plate and comb -- is a little daunting because of limited access, but I suppose doable. Will try something along those lines. Thanks again.

OK, we did it! The washer ended up not making any difference because the shift lock adjustment plate fits in between an inner and outer layer of the comb -- doesn't effectively move the plate any further backward or forward. But I removed the plate, flattened out the bend in it a little, and bent the lower portion of the plate back to put as much backward pressure on the shift lock mechanism as possible. Then I did one more tweak on the inside of the shift key arm to get it a little closer to the carriage shift contact point, and it holds the carriage in shift position without any movement back downward! Very pleased. Thanks for much for your help and encouragement, Lau, most appreciated. And thanks to Typewriter Talk for being here in the first place!

Cheers,
Doug

Aack, didn't even notice what sub-forum I was in, having originally landed here in a search for Olympia SF info. Jumped in with tech questions and one thing led to another. Duly noted and thanks!