If you want ordinary “card” loop was samarastroydetal like spring-loaded, easy to upgrade. For this of eyes loop is extracted axial rod, and the reverse installation is put one or two springs so that their ends rested on the loop. Eyes for necessary for this file.
Recommend to read
Steam bather’s dream
The sauna stove described below is not the first one I have designed and built. Before that, there were designs for a portable sauna “badger hollow” with a simple “samovar”-type stove, and...
FIVE-BAND EQUALIZER
Equalizers are designed for frequency correction of the playback devices. The scheme of such a device published by the Romanian magazine "Technium". We are talking about passive bandpass...