The Perfect Lock

DIY folding-key latch lock with secret holes

Many people know or suspect that any lock, even the most expensive one, can be opened with certain skills and tools. The design of the proposed lock is simple, but it will give an experienced burglar maximum “pleasure” before he “cracks” it. People who have ever taken an interest in these matters are surely familiar Read more…

The Foundation of a House

Finnish foundations: shallow, strip, and column types

Finnish house designs have proven themselves to be cozy, warm, and resistant to seasonal conditions and the effects of time. Finnish builder Pentti Jurmalainen discusses the specifics of laying bases and foundations for such country houses. Do you know what the parts and elements of a house are called? If not, carefully study Fig. 1. Read more…

Taming Rainwater

DIY gutter system: pipe half-gutters and pole spout

My new house is good in every way, but it has no gutter. Rain runs off the roof onto the foundation, and in windy weather it also hits the walls. In the store, drainage gutters with brackets and especially the elbow pipes with funnels inspire a quiet melancholy with their appearance. I did not want Read more…

“Almaz” Machine Tool

Fig. 1. Glass-cutting device

A diamond glass cutter cuts window glass perfectly, but using it correctly is not that simple. Unfortunately, the skill comes only after a dozen or two panes have been irreparably ruined, and even then a precise cut is far from always achieved. To prevent this, while cutting you must keep the tool constantly perpendicular to Read more…

Tiny Moped

Mini-moped for elevator: Renak frame, D-6, scooter wheels

The compact moped I designed, unlike production models, fits freely in a passenger elevator. That is perhaps one of its main advantages, since the two-wheeled little machine (which, incidentally, reaches the same speed as the “Riga-7”) can also be “parked” on the balcony of a city apartment. The moped frame is taken from a children’s Read more…

Cockroaches — With Electricity

DIY electroshock cockroach trap with Latour circuit

Cockroaches: people have tried everything to get rid of these black and reddish-brown sneak insects, but… Exterminating such hardy pests is still a problem. Especially for residents of densely occupied apartment blocks, dormitories, and rundown Khrushchev-era buildings. Among quite promising ways to fight cockroaches, in my view, are even the simplest electroshock devices. I, for Read more…