Nerf Mercury T-Pull
thingiverse
Just a T-Pull for the Nerf Rival mercury. Definitely makes the prime much easier. Uses 2 m4x20 bolts to secure to both sides of the mercury. The slightly flexible file includes notches that fit close by to keep it more secure but requires the model to be slightly bent to get it onto the mercury. This was achievable with PLA but haven't tested with any other filament so your mileage may vary. If you think this might be an issue just print the solid file and it will come without those and will only wiggle slightly.
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