***UPDATED versions****

I've modified the models, now all models have an arrow that points on which side the windows opens.

I've uploaded modified models in case there is little clearance between the window and the frame/wall to insert your hand to hook and unhook the window adjuster, just use the additional bracket to flex the model

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This remixed window block features an ergonomic finger grip and features a wider window profile than the original. 

I've included the measurements in the drawing image for reference. 

There are two models, based on witch side the window opens