I have an old Lightning Rod that's missing a guide, the one right below the tip. I can handle the replacement, but how do I know what ring size to buy? Do I measure I.D., O.D. or something else? The I.D. of the guide measures 4mm. The guides on the rod are Berkeley SS304.

Thanks!

 

Tom

Measure outside to outside diameter and inside to inside. 

guides with ceramic inserts are sized by the ID of the guide frame.  I'm not sure how the metal insert guides like the SS-304/Minimas are sized.

Thanks guys! I'll get the O.D. measurements and go from there. If it's a mm off one way or the other, that won't matter much. The rod is one that I carry in my truck for lunch break fishing, so it's not a showpiece by any means. Function over form and all of that.

 

Tom