{Collins} 75S-1 VFO set screws

Am trying to loosen the VFO dial hub set screws on my 75S-1.  Have the 
Bristol 9 piece spline wrenches (SS-508) but none of them seem large enough for the 
two set screws.  Do I need a larger spline wrench (I thought these would work 
for most Collins' needs) or am I doing something wrong?  Thanks.   Buck

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