Cutting an Allen and using sockets and wrenches is not a bad suggestion.
At a time when my funds were very limited, I rebuilt the engine in my '68 230 manual, what a neat car it was.
I took a set of Allens and cut off a 5,6 and 10. I then used sockets and wrenches and rebuilt the engine. I still have those little hunks in my toolbox, but have since bought some better metric allen tools in my more prosperous years.
Also, I wasn't stating that the tool was 1/4", I just thought it was in that general range. I hope this caused no one any trouble.
There's nothing like expediency,