ECN Forum Forums Code Related Discussion Canadian Electrical Code Topics Adding a switch in a finished house

While cutting the hole for the box to add a switch in a finished house - I note that the mounting tabs and hardware on the outside of a receptacle box would require a large or messy hole to accommodate the box - is there a specific box that works best for this purpose? (the 1110 box comes to mind - it is smooth but also too large) Also - I intend to use a bendable drill extension designed for this purpose to drill a hole through to the bottom of the wall - (I'll have a peek with a mirror before I drill) - I wonder whether there it is necessary to protect the wall somehow from damage where the drillbit inserts through the hole to prevent damage of the drywall. My intention is to use bx for the wiring - thanks