A reason the mouse cursor jumps when you do a right or left click is: you are not at the exact bottom corner of the pad. If you ar just in the lower area and do a real click, chances are, while you click the finger moves a bit and so does the cursor. Being in the absolute corner with the fingertip solves this problem.
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1981 soldered my first Sinclair computer 1K, tapedeck * 1984 build and sold IBM clones 8Mhz, 512K, 20MB HDD * 2018 messing with ultrabooks