Here's a simple way of magnetizing banners on top of Sisters of Battle Vehicles for ease of transport.
Start out with a strong small magnet, piece of sheet metal, banner, and Immolator Top. I used 6mm neodymium disc magnets.
Cut out a small square out of sheet metal. I used metals shears. Filing edges is recommended. If the small square sheet metal is bent then use large pliers to flatten it.
File the bottom of the banner so that its flat. Glue square piece of sheet metal bottom to it.
Glue magnet underneath Immolator top. If the magnet is weak, then use multiple of them. Here I used three magnet discs stacked on top of each other.
You should by now have a magnetized banner, which you can stick on top of the Immolator sprue and take off for ease of transporting your vehicles.
This method can be applied to other tanks as long as there's room to fit in a magnet underneath. Another alternative is simply drilling a hole and sticking a magnet rod or using a non-discrete flat magnet and gluing it on top of a vehicle's surface for anchorage.