Bazmaz, can you clarify…. I have a Fluke and a JJB Electronic clone to the K & K Twin Spot. I was buying the single spot and when I mentioned K & K Twin spot the fellow at JJB added a second SBT for an extra $5. Very reasonable pricing from JJB and the You Tube videos sound good. But I digress, I was thinking of putting this into my Fluke. I've seen your report on installing. Just wondering how many inches from the end to drill the hole to miss the ribs in the pastil bowl back? But now, more curious about what noise you can't live with. Can you give a more detailed explanation. Thanks