No chance with a vacuum the space is just too tight, think I may gave pushed it further down trying the paper trick ffs! Tried post it notes with no joy too. Tbh it's worth £7 to stop me getting pulled by the 5-O although I could argue that it is visible in the VERY bottom left corner :p
i did the same to mine, but u have to keep trying, i push it down that i could barely see the edge of the tax disc from the outside, but my patience paid off