I tried this with my 10" f5.6, 1" thick plate glass mirror that needed a slight tweak. I glued the puller to the centre of the mirror (based on an earlier article: although he does mention this again at the end of the referred article). It worked well and gave me perfect star images. It is probably worth a try with the 8" as a "proof of concept".
One issue: the first glue that I tried was too strong (an industrial strength epoxy), and it shrank slightly as it hardened, which did strange things to the star tests... Once I cleaned this off I used a lower strength epoxy glue and it was fine.
Eventually though I found it was a bit of a pain because I needed to tweak the puller when there were major temperature changes, and I ended up re-figuring the mirror.
- Dean