Hey guys, I had an issue before with one of my basement doors actually falling off as I lifted it up. So, I now have those "blocks" that install up in the c channel. Now, from what I've been reading here, there is one black centering block and two white ones??? Well, I ordered 12 of them and they're all one color-Black. I guess they're all the same? Anyway, I was just wondering. And the gas struts - I Know this ain't rocket science, but I am having a bear of a time just compressing them, then holding it that way so I can install it. Am I not doin it right or something?? Thanks in advance for any help.