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My wife is building the LEGO Typewriter set (21327). When she installs the gearbox mechanism at step 210, the whole thing jams when pressing the keys.

I am trying to help her and have "unbuilt" it back a few steps and checked everything in terms of being the right way round, etc.

The problem seems to go back to step 177 when a block assembly is placed. Up until then the large section installed at step 153 was free to move around an inch or so forward. After step 177 the new block installed severely restricts that movement. It is in the correct place from what I can see!

What might be causing this problem? How can I fix it?

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    The only thing I can think of is if the grey pieces from step 155 were set too far forward and they restrict the little arm's movements. Did you figure this out? Some photos might help
    – GammaGames
    Oct 5 at 3:38
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    I have actually rebuilt it for her again and have the same issue. Looking online it looks like many with the same issue - possibly gearbox too tight but I have put it together 4 or 5 times and still the same. Looks to me like there is simply not enough weight in the wee arm to re-engage with the rotor arm to move the carriage on (too much friction). She has decided not to bother but just to complete the build for its looks rather than practicality. Thanks anyway.
    – Mike P
    Oct 13 at 12:10

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