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Yes your right @Glws it’s just a quick way to measure the inside without tools but I’m guessing if you measure with the card and find it’s 45 or 37 and then put against the crown race and look as see if they match perhaps?
The credit card trick is a good way of checking for 45 degree simply place the corner of the card through the bearing creating a V as the sides of the card are 45degrees the card will rest on the bearing with no gap if it’s 37 there will be a gap