Almost 3 months have passed since we did something to the 21-29. The reason is that we have been waiting for a delivery of spare parts to the track. Finally, last week some boxes arrived with the long-awaited parts.

Now we have a summer break, but in August we will start renovating the tracks again. When they are finished, the carriage can move by itself for the first time in almost 50 years. What a lovely experience it will be!

Driving test?

On the internet there is a picture of a LK II running without a body, where the rider sits on a small platform. We have built a floor and mounted a chair on it to create a functioning driver’s seat. The ergonomics of the driver’s seat is not the best but for limited driving tests, it will work fine.

Drivers seat

The tank has only two seats, one seat for the driver and a stool for the commander, which both are missing. We have therefore taken a chair from a KP armed car, painted it and covered it with a coarse green cloth. The stool remains in the tank standing at the museum, as such, we can produce it later.

Adding oil

We have got oil for the gearbox, the steering gear and the final drives. We have filled a few liters in each unit, mainly to see and verify that there are no leaks anywhere. If everything looks good, it is time to start the engine again and check if the gearbox and the steering gear works properly.


In some old photos you can see a telegraph operator at work sitting in the cart. On his right hand side there is a visible large antenna.

In the user manual for Strv m/21-29, approved October 1, 1934, is a radio labeled “Apparat 1 W Sv”. We have not found any information about that kind of radio. On the other hand, there was an army radio station labeled “1 W Br m/28” in which Br stands for portable. In comparison the accessory lists are the same for “1 W Sv” and “1 W Br”. We assume that “1 W Br” is renamed to “1 W Sv”.

These three photos of the radio “1 W Br” are taken by Björn Hörstedt at the Army Museum in Stockholm.

Before and after

While a renovation is going on, it is easy to forget how the different parts looked like before we did order them. Therefore, I have done some before and after pictures to show the incredible difference cleaning, painting and general tidying-up does. Not to mention the feeling of knowing that things work as they should.

We start with the powertrain: engine, gear box and steering gear.

Instrumentation and wiring.

We have also replaced the modern rod antenna with a loop antenna.

You need to have a radio

In old pictures of the Strv m21, there is a triangular radio antenna mounted. On the bracket that we are renovateing, the antenna mount has been modified to carry a modern rod antenna.

We have removed the bracket, cleaned brackets for the antenna arms and the insulating plates that the brackets are mounted on

From two broomsticks, we have produced a new triangular antenna similar to the original image.