Had to solder a wire myself...
344780
This gadget started and stopped, spun up "a ways" then stopped, etc., until I took it apart and soldered a loose connection.  Works fine now.  I agree that it doesn't mark accurately, but it really doesn't matter, as long as you get the idea - good for alignment, even if the heavy side probably changes if you blade a softer ball.  Respins usually show approximately the same line, though not always.  Remember the best balanced balls will have the wildest deviations.

It's cheap, but I'd check that is actually works before I bought one....
2939963
It worked, but I had to rewire the plug.  After soldering and everything a job that should have taken 1 1/2 hours to do took 3.
3011383
Very poor QA with this product.

After trouble shooting intermittent connections far longer than I would like to admit, I found the problem area was the female to female connector. Took the connector apart, and one entire port was not soldered. They just dropped the pins in the PCB and hopped they'd make a connection I guess... after soldering all these pins myself and re-assembling the connectors work great! Imagine that....
4237627
I had to modify the dyier wiring to make it work.  But the part did what it should
2056317
for the price - this worked for me.

i am not a "tool" person, so i can not rate it like others might be able to. i needed solder, bought this, and it worked...

what i didn't like (which took a star from the rating) - the solder is wrapped EXTREMELY loose on the little spool and falls/ slides off. i don't know if that is something typical with solder, but i didn't like it!
1504831
I've considered soldering myself, but these connectors are made to order. They make for a more professional termination. The price is negligible, and the installation looks better.
4817693
Bad soldering job, Wires came off plug...feel like I wasted my Money

After contact the seller Yates Performance...I sending a pic of the harness, The seller is sending out a replacement  harness...Thank You Very Much Adam...
2799395
I received this item today cut and soldered the wire the way I needed really simply this is what was described worked great for what i needed thanks
3030148
Nice kit in that it comes with everything you need. The problem is the replacement tips themselves. I'm a novice solderer and it was really difficult to get the left channel wire connected to the end of the post. I ruined it and ended up buying another from Radioshack that had separate arms for each wire, and they had holes on each so you could pre-attach the wires before you soldered, which really helped.
1713765
This is tricky to solder, here are some more pointers.

The headphone cable I was fixing had a blue, red and bare wire.  Red is right, blue is left and bare is ground.  This is a common convention.

Use Helping Hands, tweezers and a small tip like a ST7 0.03" (0.79mm).

Before aligning the wires to the connector, strip the wires and melt some solder into the end of each wire.  This is all the solder you will need.
Thread all the sleeves and shrink wrap as shown in the product picture.  Put the metal on first, then the clear/white piece, clips and shrink wrap.
Thread the wires through the bottom of the connector and then lay the wires in the cutouts in the plastic around the pads.
Solder the left (blue) wire first.  If you don't you'll be soldering under the right (red) wire which makes it that much harder.  The sequence for ground isn't as important.
I soldered ground on the outside like the picture and the final sleeve had a hard time getting over it.  I had to go back and flatten the solder and wires down, but it worked.  It might be worth trying to solder it to the inside in the same location.
Make sure the Left and Right wires and their solder does not go over the edge and touch the connector casing.  That is ground and your headphones won't work.
I had trouble getting the Right wire to stick reliably.  I finally made sure to leave the iron there long enough to heat up the connector pad through the wire and the solder.
The job works for now.  Hopefully it  holds well for an active young man.
3395591
For it purpose, work the way it supposed to, but soldering is the way to go. Take 2 minutes to solder
3280604
Nice set of wires but if was quite difficult to solder or crimp the connector to the other end (the loose end). It will be nice if it was sold with a kit and instructions to complete the loose end.
1125341
Awesome to find this part online.. shipped and needed limited wiring know to swap out. ( this being said I have done tons of similar work )
3016833
I had that problem too. Open it with a Phillips screw driver and check the wiring on the motor. One of wires broke off on mine and I just soldered it back on. Now it works great.
3457170
After I soldered the wires in the base it worked great!  Seriously, the wires in the base were not soldered to the battery compartment and it didn't work out of the box.  Most people would just return it.  Maybe I got a bad one... great price though.
3887549
Solder came off.  Company was informed.  Just quit emailing after asking what I thought
2438385
use other 2~5% solder that is much cheaper and also works, for example US standards ones. is it type error or it is normal for made in USA?