Square helmet bolts help

[EC-17 Holdout Blaster]

Hey all, I have a friend who recently bought a scout trooper helmet. From made away creations props and he discovered that on the bolts provided with the helmet, there is a small square section near the base of the shaft, and was wondering if anyone else had any information on how to deal with that, I personally used a Dremel with a sanding bit to round the edges on it, but that took a long time and was not very practical, is there any better way to fit a bolt like that into a helmet, or will he have to sand it down?

Thanks!

Logan

[Gree23]

I used a soldiering iron and squared the hole by heating up the plastic and shoving the bolt throw. Actually works really well to maintain the face in the up position without slipping.

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[Chopper]

I marked the dimensions of the square in pencil, used a drill bit to core out the plastic inside where I'd marked, and then used a file for the rest..

[EC-17 Holdout Blaster]

Awesome thank you guys, I think I will help him try chopper’s strategy! Thanks again!