{Tidal Potomac Fly Rodders} Snake guide replacement advice needed

I broke a snake guide on my 5wt Greys rod. It has a warranty, but between the hassle of actually getting a hold of the customer service department, paying the shipping, and forking over a warranty fee, I could purchase a new rod with less hassle, the same cost, and faster shipping.......so:

Can anyone give me advice on how to replace a snake guide? I can't imagine it is that difficult, though getting the wraps back on neatly could be challenging without some sort of tool to spin the rod rather than spinning the thread. I searched online and found the new guides to be inexpensive, but I have no idea what size to get.
 
Thanks!
Clarence

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