It is a bit tricky to get the slipper back in but I found if you put the rear shaft in before you slide the bearings into the top of the housing, hold it there with 1 hand then lift the front shaft up til it hits the top deck you can just get it in without loosening the top decks.
As for the allen driver I got one from RS Components 2.5mm long ball end driver and it does the job perfect! Plus if I remember rightly it was only £4.
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