Maybe it was tightened too much from the beginning…
How old is your Strida?
Do you know how many kilometres it was ridden so far?
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I believe that - as long as there is a spacer (washer) between 336 and wheel - it should be Ok.
You can’t loose the wheel, that’s impossible. The washers’s diameter is anyway smaller than the outer bearing ring, so they can’t get in touch. -
I’ll try to list some points to look closely:
- How’s the condition of your freewheel’s teeth?
Read more and compare here - Wobbly rear wheel?
(Is it possible to move the rear wheel in relation to the frame tubes.) - Condition of cup spring 363 (367 or nowadays 367-3), washer 364 and bolt 373?
(respectively frame tube condition below - this again is crucial for the pre-tension of the cup spring) - Both bolts 274 are 100% tight?