@Wydrzyk_483984 Thanks for the model! I have printed it off and am slightly confused re the assembly. I am assuming the crank assembly is cap->crank cap->crank->crank handle (bolted to crank). Is that right? I don't follow what you mean when you say

"Not fully needed. Used as cap instead of crank"

for the crank cap? Should it not go between the crank and the cap? In what way could it be optional?

Also can you recall what size bolt you used to attach the crank handle?