Splice double braid til to amsteel blue

[John Stone]

How do I splice a 10mm double braid tail to a 3/16" amsteel blue topping lift?

Background: My current topping lift is 10 mm double braid. It also serves as a spare halyard. I'd like to replace the 10mm double braid topping lift with 3/16". I'd like the amsteel to run from the end of my boom, where it currently attaches, up to the masthead sheave, down the inside of my mast, exit through the halyard exit box, and to the belaying pin, which is on a pin rack attached to the mast. But, (there is always a but isn't there?) I'd like to splice the amsteel to some of that same double braid, to match the rest of my double braid halyard tails, as well as, and more importantly, to allow me to grip the thicker double braid for adjusting the topping lift as well as to cleat it securely to the belaying pin, or standard cleat as the situation dictates. Because the topping lift will likely never be used as a spare main halyard (though it could be) I thought the double braid tail could be pretty short. Perhaps spiced into the amsteel just inside the halyard exit box with a tail about 10' long.

I have searched the archives, looked on the internet but have not seemed to find what I m looking for. There is lots of info about installing a cover over dyneema and removing the cover from dyneema but nothing about splicing these two different lines together.

Can anyone shed some light on this? Thanks.