Re: Mercury window crank

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Try a new clip.  It will have the proper spring tension to hold the crank in place and they are cheap.  The splines don’t have much to do with holding the crank on.  They make sure the regulator turns when you turn the crank and keep the crank positioned on the regulator.  Are you having this problem with a single crank?  There is a depression behind the splines on the regulator that the clip fits into when you install the crank.  Be sure this is in good shape. 

You don’t need to go online to get the clip.  Most good parts stores (NAPA) will have them in stock for less than a dollar.  I would suggest you replace all of them.