I removed the hand wheel cover on my Bernina 1001 because the wheel was too tight and now I cant get it to do anything...sew, wind bobbin. Help

See page 72 how to avoid machine trouble of this manual
BERNINA_730_731_732_manual

https://data2.manualslib.com/pdf5/106/10600/1059902-bernina/1030.pdf?9fc73d80be994a7591153afd28834359

this may help ... there are numerous screws on the back and 3 on the bottom. The hand wheel also needs to be taken off

Is your needle in backward, are you using correct needles,
if so shut off machine, remove the pressed foot and needle plate, insert correct needle (size 90) select move needle to right hand position, , remove the bobbin case and open the shuttle cover, leaving the shuttle in place, lower the needle bar by rotating machine, after you have turned the hand wheel so that the needle reaches dead bottom, then continue to slowly rotate the hand wheel and determine if the eye of the needle is below the shuttle tip
as they intersect.
If so you can either take the machine to a qualified technician for correct timing. Or sit and cry a bit (lol)

hope this helps

try this link... http://www.sewusa.com/Sewing_Machine_Repair/Sewing%20Machine%20Troubleshooting.htm ..or this one... Sewing Lesson 10 How to Fix Tension on Your Sewing Machine ..or this one... Helpful Hints to solve machine problems or this.. DIY Fix Broken Sewing Machine ..this is all i can find on the internet at mo..

check and remove any thread build up around the bobbin carrier and shaft
this thread winds in so tight that it acts like a brake
take it in for a clean and service

What model Bernina is it? Most operate on a simple system where a rubber wheel on the bobbin winder comes into contact with the handwheel (under the cover) ... the handwheel is disengaged so the needle has no drive.......

Barbara. When you removed the handwheel did you find a bit weird looking washer with ears around the outside and to fingers pointing to the center of the washer? If so you probably put that in backwards. The center fingers are slightly bent... they would be bent toward the outside.

the best thing to do is have the machine serviced at a sewing machine
shop

Check your manual for the bobbin winding steps for your particular model.

On some machines there is a knob in the center of the hand wheel that is loosened for bobbin winding - this also disengages the movement of the needle. Tighten for sewing.

There may be an additional step, such as moving the bobbin winding pin to the right or the bobbin winding wheel to the left.

Heat the wheel with a hair dryer to loosen. If this does not help, you will need to visit an authorized Bernina dealer.