Tomos engines have many shims, and the ID of the shims used on the crank is much smaller than the ID of the shims used on the pedal arm so I doubt it's the one you're missing.
This is what you need: https://www.treatland.tv/tomos-A35-A55-OEM-countershaft-thrust-washer-14mm-p/tomos-thrust-washer-223468.htm