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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