Just to let you know your copper gaskets you ordered, have been posted to you, unfortunately my e-mail is aol and I've not been able to get on for the last two days.
Sorry that I have had to post this on here but there was no other way to contact him or let him know.
Definitely the way to go with an M20 or M21....The modern 'composite' gaskets are unreliable and unpredictable..and you can use solid copper ones more than once!...Ian