[erick (Eric)]

Yep, you've found the best tutorial for a basic collimation tweak. Follow it carefully and 9 times out of 10 you'll get a good result, is my experience. You should only have to adjust one side - I'm right-handed so for me it's the right side front prism tilt screw because I can be looking through them and holding the screwdriver on the screw at the same time. Typically the image will move some distance (hopefully enough), then stop moving either as the screw reaches the end of travel pushing against the prism, or lifts off the prism. Sometimes there isn't enough travel, so you back it off, put it back into its range of travel and try the left hand side screw.

Make sure you have a good straight horizontal line to look at. A gutter is good. Make it fairly distant - a hundred metres or more. Keep your head back from the eyepieces so you are seeing two distinct images. Adjust your eyes until the two images touch each other and you can see if the vertical adjustment is out.

Remember to set the IPD (inter-pupillary distance) first (bend them until your eyes are merging the two images into one circle). When you do get them collimated, that collimation may well go out when you change the IPD. Full collimation across the full range of IPD is a more sophisticated activity!

Have them nice and stable - on a tripod or on a cushion - to do this work.

Tell us how you go.

Oh, and carry the screw driver with them. You may need to tweak one side each time you use them, if they have been bumped.

Annoying - but you get what you pay for and with a little care and adjustment, you can get a lot of bang for your buck with such cheap binoculars.

Edit:- By the way, just worry about vertical collimation initially. This is the major problem for your eyes. Horizontal collimation requires more work (and I've stuffed one pair of binoculars trying to get that right) and usually your eyes cope well with a degree of horizontal miscollimation - your eyes are designed to merge images horizontally (you do it all day as you adjust your focus from objects further away to objects closer - even to the tip of your nose!) but not for merging images vertically (point one eyeball up and one down!!!)