Hello,
Did you find this switch somewhere? I have the same issue and I am looking for this old "C&K 30" pcb switch or whole assembly.
BTW, From what I understood, its the same assembly and/or switch for all 8800 series. So if you desperately wanna repair your 8861, you may find a deadly cheap 8841 on ebay and you can transplant the hookswitch. Of course the best way is to find a brand new one but till now this seems impossible..
Thanks