All arms are different. I had a Pioneer that tracked with rails and went straight across the back at a 90 degree angle so there was zero friction on the album and from my recollection you balanced it at 2.5 grams, which I thought was a lot back then compared to other turntables. Like a moron I gave it away along with my collection of over 300 albums when I decided to grab onto the new.
However 1.5 should get you close. I would do as much research on it as possible though because like I said, most turntables are different. However 1.5 should get you headed in the right direction.
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Some Martins
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