27-03-2021, 03:39 AM
If you've got access to a lathe, Colin its well worth turning a guide bush for the tap [similar idea to a drill guide] and try to seat it on the washer face to help keep the tap square. There looks to be a lot of lead on that eBay tap so you mightn't have to do any drilling. Also, further to Stuart's tap turner it's also possible to drill out a suitable sized nut and press it onto the squared end/silver solder it onto the squared end and use a socket which makes it slightly easier to get everything square, especially if you can get a tee-handle on there.