A Scotseal is self-contained, and has a stiff inner rubber ring that slides over axle and remains stationary, wear and sealing action is all inside the seal unit, so it's a good solution if the axle's been damaged a bit, or worn by the old seal. A GOOD product, but requires careful installation, preferably by the correct driver because if dinged or damaged a bit it will quickly fail.
"Hand install" seal is rubberized on the outside and can easily be popped into place by hand, so special care or special tools required, vs. the original seal that's a TIGHT fit and pretty much requires a custom driver, and some skill and care to install without damage.
Both seem sensible to me, time moves on, different ideas and ways of doing things come along, I don't see it as a BAD thing to have those extra seal options, IMHO.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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