Development of a contact group (brass)

It is necessary to develop a body and pusher closing the chain of the contact group, without fixation, mechanical.
Main details:
1. Body (metal) round, diam. 20-28 mm
2. Pusher (metal/plastic)
3. Additional details at the discretion of the contractor.
For production, competently executed, working drawings are necessary.
Low-current chain 6B/5-20A
More detailed TK when discussing with the contractor.