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I've used a BR600 for years, and after a couple of years, I realized it would help if the nozzle was closer to the ground for me (I'm 6'5"), but for whatever reason, the way Stihl joins their nozzle parts, and the nozzle parts they sell, you can't just insert an extension onto it. So, I tried a gluing an extension onto the end of the nozzle, but that only worked for a short time, likely due to both extreme cold (-30C and colder) and stress (from the tip hitting various things). After gluing it together a couple of times, I switched to using pop rivets to make the extension, and that worked great.

I switched a couple of years ago to a Husqvarna 580BTS, as it has significantly more blowing power, and as a bonus, I could just buy an additional middle section for the blower tube, and it was a good length for use (perhaps a couple inches too long, but still WAY better than 12" too short). The downsides for the 580BTS for me are that it's much louder than the BR600, the kill switch wires break regularly so I have to use the choke to kill the engine (breaks right as it comes out of the control due to flexing as you use it), and the offset control from the tube causes pain in my elbow when I use it a lot.

I just recently bought the BR800CS, and like the BR600, the blower tube is ridiculously short for me.

Here's a pic of the 580BTS (left), BR600 (center) and BR800CS (right, with original tube, but it is missing a short tip at the end). Also, there's new blower tube I bought to use as an extension to the existing tube (it has the tip removed from the BR800CS).
IMG_1495.jpg

I removed the whole tube assembly from the BR800CS so I would work on it on my bench, as well as access the inside of the tube, as the end section doesn't come out the front.

Connecting the outlet end of the existing tube to the inlet of the new tube was actually pretty straightforward, as the outlet end is tapered a bit. So, I first measured to just past where the ridge on the new tube was, where pop rivets could be put flat against the tube:
IMG_1498.jpg

Then after marking how the two tubes overlapped, I measured the outlet of the original tube 1/4" past where the pop rivets will go, marked it with tape and then cut the end off using an angle grinder with a thin cutoff wheel:
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I used Aluminum rivet/aluminum mandrel, 3/16 diameter, 3/8 head, 7/16" under head pop rivets, with backing washers for holding them together. I picked using aluminum pop rivets instead of steel mandrel ones, because the tubes are plastic and the steel pop rivets take a lot of force to "pop", and it might cause damage to the plastic from being squeezed too hard.

Rivets & backing washers:
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While I have long arms, they are a little too big to reach into the tube to put the backing washers onto the pop rivets, so I needed to use a part-grabber tool to put them on:
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I lined up the tubes, drilled & riveted one side, then drilled & riveted the opposite side, then worked my way around the tube, installing 12 rivets in total:
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Finally, a comparison shot of the fully extended new tube vs the other machines:
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Now, it's probably a little too long, but I can use the adjustment mechanism to shorten it to what is just right for me. From waving it around a bit, it seems to be attached firmly and won't readily break.

As a downside vs how I lengthened the BR600 tube, if any part of the blower tube needs replacing (other than the short tip at the end), I'll need to drill out the rivets and remove the extension, as all the other pieces (tightening screw [the orange part you see], clamp [what the orange part squeezes], and rear part of the tube) need to go forward over the front tube, and they can't go over of the ridge on the tail end of the extension. If I do need to take it apart, I'll probably grind down that ridge and see if I can then slide it through.

No thanks to Stihls gatekeeper, Martin Deereline here in Edmonton, for who full MSRP isn't enough, they need an extra 25% to make it worthwhile for them to bother ordering it, and even that wasn't enough for them to order it right away like they said they would. When you can go "well, everyone does the same thing" [the extra 25%, other stihl dealers here in edmonton do the same markup], I guess you don't have to bother with customer service...
 

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Discussion Starter #2
If you are a taller person (say, over 6'), extending Stihl's blower tubes makes a big difference, particularly blowing snow, but also for leaves.
 

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Same issue for me and my Husky, but I needed/wanted the gutter cleaner kit. At the same time I ordered a couple replacement tubes.

And used rivets to custom my tubes!

Living near Portland I sometimes meet basketball players, at 6' 2" I'm always happy to meet TALL people!
 
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