you can re-bend it and if it breaks just bend it again. lastly i clean the thread tentioner and make sure the check spring is bent right to function. i remove all moving pieces from the bottom, bobbin, most of the nose (BTW there is an access hole to release the screw tension on the needle that is cut behind the nose to use it turn the balance wheel until the needle shaft it at its bottom position and you can feel with a flat screwdriver when you can access that screw and release it) i always remove the thread take up bar and make sure the wheel on that turns easily i never remove the large wheel because that is part of the upper horizontal bar i said never remove that. In dealing with pieces on the bottom always look for pins not just set screws.
and the access panel at the balance wheel. you can access them from the large access panel in the back. on these vertical shafts you can do as much for the function by using sewing machine oil and/or alcohol to clean them into functioning. gently wiggle the parts and they will eventually slide back together it all looks like strong steal but it can be brittle and put in the wrong position it will break.
persistence will eventually get it back together but remember DON'T FORCE ANYTHING anywhere EVER. there is one vertical shaft that can come out but getting it back in is a lot of hit and miss. do NOT try to remove the upper horizontal shaft there are a few pieces that are almost certain to break. when you take the bobbin tensioner out you might as well take it apart and clean it too as rust and grime in that often cause a tension problem. also the disassembly order is pretty firm the nose can be done at any time but the bobbin area and the bottom go back and forth a lot.
in any event scratch a timing mark if there isn't one. often the timing is marked but not always luckily the timing works fine when it is close. I have done complete restorations on so many Singer 66's that they are now pretty easy.
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