I have a stanley 99e. i took it apart ti change the blade, without paying attention, and now i can't re-assanble it properly. I can't find any instructions online.

You must be doing it without paying attention.

First never take a tool apart if don't know what you are doing, second go to the Stanley web site and you can buy or download a copy of the one you need.

Hello, Go to this youtube website too see video on changing the blade.

If there are no small screws on the back to come out, it's a 'clip' type and will need a small thin blade to pry the sides apart to open.
carefully use a knife blade to pry it open.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

There are at least 18 different models of Powerforce. There are too many parts and pieces to be able to describe what you need without seeing it. I suggest paying your local vacuum shop to put it back together. It may need a new belt, brushroll and/or filters. Do scrimp on these things if you want it to work properly.

Check your blade latch is working properly. If you took your clipper apart and your blades are not cutting it is one of 2 things. Your blade drive is not assembled properly or your blade latch is not holding the blade on the clipper. If you took your blade apart, check the blade alignment. The cutter blade needs to be slightly behind the comb blade.

This is a terrible tool took it apart to get the blade out of the handle and haven't been able to get it back together again.

buy a new one they are cheap

how do i reassemble the wahl pro series pet groomer

There is a SLOT in the end of the knife. Simply insert the strip of new blages in to the slot and you are ready to go.

Good luck. :)