I still have a BWD503 that I fire up from time to time. That's probably
a lightweight compared to the 521 but it's heavy enough.
I'll have to check eletrotanya for the full 503 manual and if not there
I'll upload it.
keith on the 7 Oct 2021 wrote;
"He asserts that the claim is true, so, if
it is unproven, he is lying."