This may sound odd and is slightly off-topic.

I got a bargain on a handheld box tape dispenser which is similar to
this http://snipurl.com/l6my. It takes 50mm (2 inch) adhesive tape
and is used for sealing boxes.

I'm not at all sure I have threaded the tape correctly because the
loose end seems to flap about for a inch or two and is never in the
right place to be used a second time.

Maybe my bagain dispenser is badly designed or maybe I have threaded
it wrongly.

Can someone here, who I figure might use these things, tell me how to
load this sort of dispenser correctly.