If the Backpack is already apart, then measure
the string so that you can wind up one side 16 times. Then wind the
other side once. (This may take some playing around to get 16 winds.)
Make sure you wound it the right way. You can tell it's correct when you
put the
cog into the backpack. It has a cut away on the side of the backpack for
the string to run though. It should run right off of the cog (spool)
through the hole. If the string has to pass along the bottom of the back
pack before coming out the hole in the bottom, then it's wound the
wrong way. In which case unwind it and do it the other way.
Now put it together (put the bushings in the top and bottom too) and
test it while holding the backpack together. Make sure it runs up and
down smoothly, (you may have to sand the pulley [spool]). If you do sand
it, just sand it very lightly just to round it better or to knock off
the burs.
If you have too much drag when going up the string, it may be wound the
wrong way. (See above)
When it is working just the way you want, very carefully open the
backpack and put a small drop of oil in the center of the spool. (Don’t put
too much on or the glue won’t stick.)
Put it back together, recheck the backpack by running it up and
down. Now
very carefully put glue (model glue works great for this) on just the
sides of the backpack. (Don’t put any on the top or bottom or you might
get some on the string.) The glue should suck into the seam with a
capillary action. Wipe off any excess glue.
Wait until the glue dries and then play with your fixed toy.
Update:
Here's
how to take the backpack apart:
Use a screwdriver and a hammer
Put the screw driver in the seam
and tap it with the hammer, it's best to use the seam on the
bottom as this operation may cause tool marks.
The once the screwdriver is in the
backpack twist it to crack it open.
You can then use the screwdriver to
wedge it in and crack it all the way around.
Warning:
Pushing too hard may
cause you an injury, like stabbing your hand with
the screwdriver is you slip off.
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Monday, September 07, 2015
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