I searched on ELECTRO PJP website and other website. Maybe banana socket for 4mm diameter. I taked page by page in their catalog "Test & Measurement", nothing similar to mine own LCR. Axiomet does not sell to me. They don't even have an email address. I asked people from TME and they told me that they don't have it. I think I'll start drawing in 3D and then I'll see where I will make them.