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I had a lockable window winder that needed to be replaced. The issue was that it was stuck in the closed position. Which meant I couldn't unwind the chain to access the window sash screws. Unfortunately the key cylinders are not replaceable, so I thought I would share how I was able to replace the winder in case anyone else was faced in the same scenario.
Materials
Tools
#2 Phillips Screwdriver
Impact driver with #2 Phillips Bit
Drill with 2mm pilot bit
Kango long tipped marker
Steps
Step 1
The first step is to remove the winder screws, which frees the window to open.
Then from the outside, remove the bottom cover plate screws of the winder to release the chain.
From here you can access the 2 sash screws and remove them
Step 2
Bunnings only sell right handed winder handles in a variety of colours. This meant one of the fixing screws from my left hand winder will be exposed. This will be lightly sanded and painted once the new winder is installed.
Open the new winder fully and position the sash fixing plate to the existing screws.
There is an option for increased security to drills holes through the sash and fix an external plate with stainless bolts. But I didn't want to spoil the external finish with the branded end plate.
There is also an option with this model winder to set a shorter or longer opening length. I chose to keep it at standard.
Step 3
Wind the chain fully in and position the winder flush and square with the window frame.
Mark the fixing holes with a Kango long tipped marker, which is one of the handiest things to have in your tool kit.
Drill the pilot holes and fix the new winder in to place.
Step 4
Double check the winder system the locking mechanism work and your done.
Evening @Nailbag
Nice work and nice work thinking outside the window.... 
Seriously couldnt resist lol
Will be keeping this in mind for sure. One thing I will be buying next time I go to Bunnings tho will be that "Empire Long tip marker" I had not come across it before.
Dave
