Shaver manufacturers don't like it when you do this

I ordered a couple of sets of blades for my Philips series 1000 shaver, and they had notches sticking out of them so they didn't fit. I cut off the notches with a pair of side cutters and they fit perfectly after that.

[@hestheMaster]

Most guys don't know this but the shaving cutter head and stationary blade cover are
matched sets so don't interchange them or you will experience lower shaving quality for
a week or two until they seat properly. They sent you the wrong set of replacements
by the way. You need the SH30/52 and always request the manufacturer's sealed box
and not just the sealed placard they come in. Some unscupulous sellers actually do that!

[@FranksPlace-jk7pj]

They sent me the blades with shaving cutter heads as you can see but I didn't have time to wait for new ones, hence the modification. Good to have the right part number for next time, thanks.