openquery with variable server

Hi,
I need to run the same query on multiple linked servers. I've never passed the server name as a variable, but I'm trying to now so I don't have to paste the same query over and over.  I can't seem to get the single quotes right. I've tried up to 10 single quotes on each side of the server variable, but it always comes back with an error. 5 quotes on each side looks right, but I get a msg: Incorrect syntax near ''. So I go up to 7 quotes on each side and I get a msg: Incorrect syntax near ''ServerName''.  Is this possible to do? What am I missing?

declare @SRV varchar(20)
set @SRV = '[USOSCS301\INST1]'
--Check each server/database until the merge/order is found. Get the nonsortable records, then get the confirmeddrops.
SET @SQL = 'SELECT * FROM OPENQUERY(''''' + @SRV + ''''',''
			Select pd1.OrderID,pd1.SKU,pd1.ConfirmedDrops,pd2.Sequence,pd1.LabelField5,pd1.CartonID,pd1.WaveID,pd1.DropLocation,pd1.SorterID,pd2.Brand
			From AG_SORTER0.dbo.productdistribution pd1 with (nolock)
			Inner Join AG_SORTER0.dbo.productdiscription pd2 with (nolock)
			On pd1.SKU = pd2.Product_Id And pd1.LabelField3 = pd2.Brand And pd1.WaveID = pd2.WaveID
			Where pd1.ConfirmedDrops = 0
			And pd2.prodhandcode = ''''N''''
			And pd1.OrderID = ''''' + @MRG + ''''''')'
INSERT INTO @Results
EXEC (@SQL)

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