How to Remake a Trimmer From Fishing Line to Knife

For many summer residents, the trimmer has long become a familiar and almost indispensable technique. But it is not always possible to acquire a model that allows you to satisfy all needs. It happens that the trimmer copes with fresh young vegetation easily, but there is a desire to clear a place behind the fence or along the driveway, and tall, ripened grass turns out to be "too tough".

DIY trimmer head

We offer the option of self-manufacturing a nozzle for a trimmer from simple (almost improvised) tools.


  • metal perforated plate (100 mm x 240 mm)
  • 2 hacksaw blades for metal
  • 4 screws and 4 nuts M5
  • 4 washers and 4 enlarged washers

From a safety point of view, hacksaw blades should not be completely red-hot.

Everything you need to make the nozzle

The most difficult part in making the nozzle is to symmetrically mark and make holes for the knives and the trimmer shaft. That is why the finished perforated plate is chosen.

Working process:

First you need to make the base of the nozzle. To do this, we cut out a square grinder from a metal plate with a side of 100 mm. You need to mark it in such a way that a hole is exactly in the center (at the intersection of the diagonals). To do this, measure the distance of 50 mm from the center of the selected hole perpendicular to the short side of the plate and outline cutting lines.

Mark the base of the nozzle

We cut off the excess and get a square of 100 mm x 100 mm. Now you need to slightly round the corners and drill a central hole under the trimmer shaft.

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Round corners and drill a center hole for the trimmer shaft

We cut the metal sheets, measuring 8 cm from each end. We get 4 blanks with finished holes.

We cut canvases for metal

These blanks need to be shaped like knives. To do this, we outline the cut line on the eye (special accuracy is not required), we fasten all 4 workpieces together and grind the excess.

We cut knives from blanks

As a result, we get the knives of the same weight and size, they can be sharpened a little on one side. Now all the parts of the homemade nozzle for the trimmer are prepared, you can start assembling.

Everything is ready for assembly

We put a small washer on the screw and insert it into the corner hole. We put on a knife from above, placing the sharpened side in the direction of rotation of the trimmer shaft. Next comes a large washer and nut, which is not tightened so that the knife rotates freely. In the same way we attach the other 3 knives.

Fasten the knives

The end of the screw must be riveted so that the nut does not fly off.

Video: How to Remake a Trimmer From Fishing Line to Knife

The end of the screw must be riveted

The nozzle is ready. It is installed with nuts to the ground and fixed in the same way as a three-blade knife, which comes complete with a trimmer. In a collision with a stone, the knives fold and go a little inside.

This idea was suggested by our regular author of the video, Tatyana (Tula region). You can see in more detail the whole process of manufacturing such a nozzle for a trimmer and find out some nuances by watching the video that she prepared.

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When working with a trimmer, it is important not to forget about safety precautions using any attachments, especially homemade ones.

We suggest discussing this idea in the comments to the publication. Share your thoughts with us, as well as tell about your successful solutions.

Without accepting either side of this sharp (literally and figuratively) discussion, let me show you one of the latest models of lawn mowers by the German company Robert Bosch. It also provides for a deflecting knife and an arched staple, which excludes the “striking” of the knife for objects not envisaged by mowing. I show the general view of the lawn mowers and the knife itself, in two positions.

General view of the lawn mowers

How to Remake a Trimmer From Fishing Line to Knife

Deflected knife

Folded knife

Good evening everyone!
Exactly three years have passed since the discussion of the “acute” problem for the trimmer. Over the past 1000 days, a clear picture has emerged: “Glory to the author, a craftsman who carries out an experiment on himself to achieve the yield strength of the metal from which these knives are made. He has every right to risk his own health. ” Now in stunt films it is often possible to see frvza. “Do not try to repeat the movie stunts performed by professional stuntmen.” The very first article should have ended with about the same phrase:" Dear summer residents. This is my personal experiment. If you are not confident in your locksmith powers, please do not repeat it. AND MOST IMPORTANT. I am not responsible for the operation of the tool, made in the wake of my article."
And the last one. Do I see errors, judging by the photographs, the implementation of this tool. Yes, I see, and rude. Look carefully at the plate, which is the carrier for the four knives. Look carefully at the FAR RIGHT FOR US HOLE in the photograph.

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Alas, the author of this apparatus does not even suspect how a hole should be made under the shaft.

I inform you. the distance from the hole point closest to the edge of the plate to the very edge should be NOT LESS THAN the diameter of the hole itself. Students of mechanics will learn this truth no later than the second year of the institute. What do we see here? A thin isthmus resembling a narrow Perekop making a peninsula from Crimea. This is a priori a place that is weak in this design. it experiences the same loads as other knives, but the “digging” is very thin there.
Where subtly, there.
I would like to hope, and quite sincerely, that over the past three years this isthmus has not undergone loads comparable to the yield strength of this metal, but rather the alloy from which the hole plate is stamped.