Trustfire WF-188

Anyone remember where the pictures are that show how to modify the WF-188 to decrease the resistance of the slide bar? I know this is an old subject and I apologize, but I want to get one to charge some 32650 batteries. This seems to be one that is cheap enough and might do the job. Thanks

Here you go,

Blord, I appreciate your help. Now I can go to work.