If they're adults, they've eaten on their own their entire lives and do not require assist or force feedings.
Unless the owner gets fidgety and does it for no good reason.
My thoughts on force feeding is go to YouTube and look for vid's from justin kobylka and watch the one JKR Pro tip #5 at the end he talks about force feeding ball python's and his view of it.
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1.0 Normal Ball Python
0.1 Dog
1.0 Cat
1.2 Kids
Will trade kids for a pair of bumblebee male female