"In BT-2 turrets with dual machineguns that still had a mantlet, no changes were made. Where there were no mantlets, a successful combination was used (fig. 38) designed by Red Armyman Sidorov, nicknamed Sidorov's Mantlet. In this case, the DT mount from a 45 mm gun mantlet was used. As no more than 100 pillboxes could be made if we only used DT machineguns, a simple mantlet for the Maxim machinegun was made and has proven itself worthy (fig. 39).
Pillboxes made from old tank turrets at UNI make powerful fortifications. There is the "YuL" type for 45 mm guns and "VS" type for 76 mm guns and larger (fig 40-41).
Machinegun turrets are attached to a turret ring and installed on top of a blockhouse (fig. 42), but artillery turrets are installed on a special welded metal frame (fig. 43). Starting with a simple blockhouse on top of a ditch, we gradually perfected the design until we arrived at the method shown in fig. 44: turrets (machinegun and cannon) are placed on a blockhouse that is installed on top of a dugout where the crew lives. A more detailed description would be excessive. Let us focus on some characteristic cases:
- A turret with a 152 mm gun needed to be installed (fig 45). This took 1950 man-days.
- Same with a turret with a 85 mm gun.
- The turret and its platform are always kept clear of snow and water.
- The turret ring is covered with a warm cover made from sacks reinforced with felt.