Is it common practice to glue(super glue) slates together when installing them? This would be for a 1963 GC table.
By better mechanics...yes.
Do you place a playing card between them first ?
Only if there's a gap in the slates![]()
even if there dowoled?
With doweled slates, I still glue the outside edges of the seams, as I've still seen them separate there as well.