Update
Updating database... Please wait.
Tuesday 16 January 2018 at 01:31
When I restored my 1972 Sky Jump I grounded the transformer, added the 3 prong plug and then ran the braid wire to all appropriate metal parts being careful to make it look like a stock factory installation, as if this was available when it was created. I’ve attached a few pics that I took when I...
Source: http://pinside.com/pinball/forum/topic/do-you-ground-your-ungrounded-ems-poll/page/2#post-4178018