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Tach seal help please?

yalefty

CB750 New member
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Hey everyone, new member and new to bikes so hoping I can get some insight here... I have a 1977 cb750F that has a tach seal leak, but I can't figure out how to get the old one out. I tried the dental picks and also tried the wood screw thing, but when I was pre-drilling I hit metal as soon as I began drilling. It's like the old seal is incredibly thin. Now I've got a really small notch in the metal (is that a big deal?) and the old seal is still in there, as you can see in the picture. Any ideas?

Also, I bought the seal below (with the ring and L 1 printed on it) but it looks like the old one is like the one in the other picture (no ring, with all the numbers). Does this matter? Thanks for any help! I'm hoping to get more active on here in the near future.

IMG_20190423_171733.jpgtachseal1.jpgtachseal2.jpg
 
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