There have been a few mentions of the after market sump plates available so I thought I would put a post on about what I have done.
Buying the alloy ones is the easiest way to go plus you get a magnetic plug but if you dont want to spend the money or, like me, you like to do things yourself then you can.
First thing to do is clean up the sump plate and unsolder the gauze. Drill a hole, I use 3/8", then weld a nut on the inside. Cut a bolt to length and put a fibre washer on it and its done. You can resolder the gauze back in (which is what I do) or use one of the aftermarket types that sandwich between the plate and crankcase.
Put it back together and you have a sump plug so are able to drain the sump if necessary.
Like I said, its easier to buy one, but if you have some basic tools you can do this for no cost. I use a cycle thread nut and bolt but you could use any thread.
It is a nuisance not being able to drain the sump on the A models, I dont know why they didnt have a drain plug, all other models do.