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My pedal came off my exercise bike/cross trainer. I have tried putting it back on, but the big screw will only go in so far. It is turning twice then getting stuck. Can anyone tell me what I need to fix this. I don't know the names of the certain parts etc to search myself. Thank you.

My pedal came off my exercise bike/cross trainer. I have tried putting it back on, but the big screw will only go in so far. It is turning twice then getting stuck. Can anyone tell me what I need to fix this. I don't know the names of the certain parts etc to search myself.