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Inverness Engineer Is Putting Chainsaw Sharpening Shops Out of Business – And They Know It
By Craig Merritt
April 14, 2026
Inverness – What originally started as a field frustration on a professional logging site is now turning into one of the fastest-selling chainsaw tools in the Scotland.
The idea is simple: a compact sharpener that brings any dull chainsaw chain back to factory-sharp in under three minutes — without removing the chain, without a grinder, and without any prior sharpening experience.
That's exactly what David Werner (52), a forestry equipment engineer from Inverness, asked himself after years of watching professional logging crews waste hours and money on sharpening methods that didn't last.
"Every crew I worked with had the same problem," David explains. "The chains would go dull after a few hours of hard cutting. They'd stop, file by hand — usually at the wrong angle — and within minutes the chain was dragging again. Or they'd send it out and wait days to get it back."
With over 24 years of experience developing tools for professional forestry operations, David couldn't let the problem go.
"The concept isn't complicated," Werner says. "Every chainsaw chain already has the correct geometry built into it from the factory. The problem is that hand filing and cheap grinders can't reproduce that angle consistently across every tooth. So every sharpening session makes the chain slightly worse than the one before."
After more than a year of prototyping with professional logging crews in the field, he finally built a working version: a compact clamp-on sharpener that locks the correct angle automatically and guides every tooth through an identical sharpening pass.
The outcome?
Factory-sharp results in under three minutes — with no skill, no guesswork, and no risk of burning the steel.
"I handed it to one of the guys on site — someone who'd never sharpened a chain in his life," Werner recalls. "He clamped it onto the guide bar, turned the handle along each tooth, and was done in under three minutes. Then he fired up the saw."
The chain cut cleaner than anything the crew had sharpened by hand all season.
"By the end of that week, every man on that site had asked me where to get one," Werner says. "Nobody could believe something that small could produce results like that."
What started as a field prototype for professional logging crews eventually became Klampero — a precision chainsaw sharpener now used in more than
- Automatic angle lock Clamps directly onto your guide bar and locks the sharpening angle automatically — the same method professional forestry crews use in the field.
- No skill required Turn the handle along each tooth. The tool guides the entire process. Anyone can use it correctly on the first attempt.
- Works on any chain Compatible with virtually all chainsaw bars, from small homeowner saws to full professional rigs.
- Compact and portable Small enough to fit in a shirt pocket and light enough to carry on any job site — no cables, no electricity, no bulk..
Klampero is ideal for anyone who:
- Stop paying sharpening shops £30–£40 per visit for results that don't last
- Bring chains back to life that they assumed were ruined
- Sharpen on the job site without hauling heavy equipment
- Cut faster, cleaner, and safer without buying replacement chains
Timber contractors, arborists, tree services, and serious homeowners with acreage are the core users.
But weekend firewood cutters and property owners with occasional clearing work are buying it just as fast.
Spring cutting season is here — and demand for Klampero is exploding.
"We can barely keep up with the orders coming in," Werner admits.
The problem: as a specialized production operation, Werner cannot manufacture unlimited quantities.
"We currently have around 1,500 units left in stock. Once they're gone, it will take at least 4–6 weeks until the next delivery."
Klampero is currently offering 50% off on this production run through their official website.
This isn't a permanent price.
Once this batch clears, inventory takes weeks to restock — and the discount comes off when it does.
Craig's advice is simpler than that.
"You've got chains sitting in your garage right now that you think are dead. Run Klampero on them first. Then decide."
Demand has spiked significantly since this article was first published. As of today, stock from this batch is limited. Once the current inventory is gone, the next restock is estimated at 4–6 weeks — and the 50% discount will not carry over.
Click here to check availability and claim your 50% discount →
Offer valid only through the official Klampero website. Not available on Amazon, eBay, or in any retail store.
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