Actually a retired friend is doing the work and I am trying not to get shocked.
Throws a 8-12cm spark easily.
This particular unit is a post WWII soviet educational model, produced in Poland. Best guess is mid-1960s.
Can’t even explain the “why” in how I came to buy the then decrepit device from a (formerly East) German dealer or why I wanted to set it right. Guess it just “sparked my interest” some how.