we have this rotary switch in our bedroom - used to open and close the window shutters.
I am unable to turn the knob to open the window - seems to be stuck.
is this available in Bunnings and is it easy to replace this as a diy?
I am not aware of us stocking a similar switch mechanism.
Replacing the switch mechanism requires electrical work and is not a D.I.Y. project.
Let me mention a couple of our knowledgable members @bruce93 and @HandyAndy. They perhaps would know where to get a replacement switch or they might advise that contacting an electrician is your easiest option.
Please let me know if you need further information or had questions.
however, i would highly suggest contacting a local electrician, or at the very least speaking to the (or any) window shutter manufacturer/installer.
this would likely be a proprietry product, or something that can only be purhcased at a window shutter manufacturer or electrical wholesaler.