I need help with assembling parts which I highlighted in the picture. I tried varoius types of constrain but I cannot attach those parts, to have them bound together. Could you please advise me about technique I should use in this particular case. The rest of the clutch part I have done with the success
I would try this command in the assemble tab, to see if it helps you. Looks like you have some tangent constraints and
I find this command most useful in these situations.
Mate - Flush workplanes.