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Fitting sliding sash in patio door


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Morning all

I've been struggling for a couple of hours to fit the sliding sash back into the frame of a patio door.   

The frame is plumb and square and secured and the fixed sash goes back in neatly.   The sliding sash will not cooperate though.  Like it's 6mm too tall.  

Any hints please?





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You will have ANTI LIFT BLOCKS these are to prevent burglars lifting the door up, you need to locate these at the top and lift the sash in a position away from these blocks, it will be a snug fit. 

Thats all I can think of. 

Im not sure if you can remove these block, fit the sash, slide the sash open and then refit the blocks. 


Its been a while while since I’ve done one. 

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