Allan, that is a great collimation how-to link,
Dan, note that the article in the link says that when you go through the collimation process, look at the situation of the secondary FIRST. Us Newtonian owners are often very guilty of neglecting the secondary's total situation, espeically if we use a laser, only tweaking the secondary's collimation bolts to get the laser centered on the primary. The laser will not collimate the secondary.
This took me a long time to understand, having used only a laser for a long time, yet the image I was seeing I could tell was still not perfect. I did first have a Cheshire eyepiece before the laser. Not completely understanding the collimation process, I ditched the Cheshire, and paid the consequences. I've now got two Cheshires, one 2" and a 1.25" for focusers of each type.
It does take a bit to get you head around at first as to what is going on with collimation, but once the penny drops you will slap your forehead and think - 'and
that took me
that long to figure out???!!!'
Now the process for me takes moments, and is actually a welcome task at the start of the night's viewing as it gets me in tune with the scope and what is going on with it. Newtonians have several moving parts, and they do move.
Oh, and that homemade collimation cap of yours, you can paint a little white ring around the hole on the inside of the cap to help you see it better. Even better is to make a little ring from reflective tape (even if just square with a round hole punched out of it) and placed on the inside of the cap around the hole. If you like, I've got some reflective tape here at home, and I can make one for you and chuck it in the post. Let me know. I've done this to my 2" Cheshire and helps a lot.
One last thing, if you do end up getting a you-beaut Cheshire, don't ditch your homemade one. It may stay in the cupboard for a long time, but the time will come when you will need it... I've still got mine I made from an old Kodak film canister which still works fine.
Mental.