Hi I have a PC 503 belt sander that I need to add oil to. I know I am suppose to fill until the oil is level to the bottom of the hole, but there are 2 oil plugs on the right of the sander. Which one do I use for gauging the oil level, the top one or the bottom one, the difference between the 2 is quite a lot when it comes to oil volumn. Thanks in advance. Any info would be greatly helpful.
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