I've seen the type of "jiggle" you're talking about, and you might be close to what the problem is...it's very possible it's the POSITION SENSOR having/developing a "dead spot" on either the wiper or point-of-contact on the winding of the sensor itself.

These things aren't that durable like the jack in the trunk. You should be happy it's lasted as long as it has.

Get some new ones and replace 'em. Your "oncoming traffic" will thank you...

Now, as for "calibrating" the new installs? I can't even guess what's involved if there's any involvement required.

Good luck with the fix.

__________________

M. G. Burg
'10 - Dakota SXT - Daily Ride / ≈ 172.5K
.'76 - 450SLC - 107.024.12 / < .89.20 K
..'77 - 280E - 123.033.12 / > 128.20 K
...'67 - El Camino - 283ci / > 207.00 K
....'75 - Yamaha - 650XS / < 21.00 K
.....'87 - G20 Sportvan / > 206.00 K
......'85 - 4WINNS 160 I.O. / 140hp
.......'74 - Honda CT70 / Real 125
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“I didn’t really say everything I said.”
. . . . . . . . . . . . . . . . . . ~ Yogi Berra ~