The biggest reason I see is to have them before the model is discontinued. When I bought my Garrett Groundhog all those many years ago, I bought 4 extra coils of different types. Never regretted it. Now they are very hard to find and I have them lined up, pretty as can be, for whenever I need them.
Read the capability of each coil you want and decide if you will ever need those. Be practical and you'll be fine.
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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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