my wiper (passenger side) sets further than the window.. as in it'll wipe the screen and then go over the window rubber and sit on the body..
how do i go about adjusting it?

take it off the spline reset the motor till the spline is as far to the bottom of the window as possible then set the wiper blade back onin the correct position

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12 Months ?????????????

is there any way to reduce the arc that the wiper runs across. Mine seems to go about 190 degrees which means when its as it is now it runs off the window on the passenger side, but when I do what you suggested above, it runs off the window on the drivers side... (I hope that makes sense)

How can you adjust it to run say a 160/170 degree arc to stay on the window...

Probably the wheelboxes are worn, letting the wiper flop further than it should...
No you can't adjust this. Need new boxes..

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.