Can SBP front drums be driled for large 4.5 BP

i knocked the 4.5 circle studs out of an adapter bolted it up and drilled with a 1/2. inch bit thru the adapter as a pattern and used rh studs with a .520 knurl. instant 4.5 ,some weld up the material where you drill but you can use thick i/2 washers on the studs when you install them to reinforce the thin part of the hub