I use these: http://www.ebay.co.uk/itm/HEADSET-PRESS ... 19d68b2a7b
you just have to keep checking everything's square as you wind it in, take your time and back it off and adjust if its not going in straight. Only do one cup at a time of course.
I use this every other day for shopping and running errands locally instead of using the car, must have paid for itself in petrol many times over in the last couple of years:
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