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Hi Ed, thanks for replying so quickly. Looks like that little sprocket adjusts the resistance of the takeup tension arm. Funny how several minutes of scrutiny didn't reveal this, but a quick glance later did. I looked on a BR-S500U which simply had a retaining washer instead of the sprocket, and that told me all I needed to find out.
I use the Tentelometer more than the torque tape for the same reasons you mentioned, but when the tape does work, it seems to give me a steadier reading than I can obtain when holding the Tentelometer - and possibly just a touch more accurate. Definitely nice to have both on hand. If I could find the JVC alignment tapes I don't yet have, that would be a glorious day in my life. Thankfully, the electrical alignment seems to be fine on all the JVC's and I haven't found an urgent need for them.
I found out something about lithium grease - it's terrible after a few months. It gets hard, gums up, etc. I'm going to start using Dow Corning High Vacuum grease instead - it has proven itself to stay greasy and safe for plastics. We use it at work where a brass leaf spring snaps against a plastic detent wheel. Anyway, I'm rambling - thanks again Ed!
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