Thanks all for the comments. I feel a lot better about having someone come to the house. I agree with talking to them first. My son has sold several...
That is a remarkable wealth of knowledge! It is almost word for word what my go-to Machinist and engine mechanic hero told me when I had him put new...
I'm also with Roger and Thomas on this...never publish the information in the clear in public, but at some point...and you have to use your intuition...