Ok... first go buy an "Allen kit"... it is a compact allen wrench set in a foldable "kit' that keeps them altogether... maybe $5.
Next... I don't know your ped well... but it sounds like you need to take it somewhere and get "Heli-Coils" installed where the old studs stripped out.
It will then be fixed permanently, and you won't have to worry about that anymore.
They will probably cost $20 or $30 apiece.
A moped shop MIGHT be able to do the heli-coils... or a lawnmowr shop, or a motorcycle shop... or even a car garage... if these stud locations are easy to get to with a drill motor, tell them that... they want it to be easy... otherwise they won't take it.
Hope it works.
It will probably take at least 2 days for them to get to it.