Air Arms Owners Club

I'd like to try open (dioptre) sights on my S400F, but the problem is attaching a foresight. I've tried Google searches, searches on here and on other fora but to no avail.

Is there anyone on here who can, or knows someone who can, make an adaptor to fit to the muzzle of an S400 to provide a set of standard foresight dovetails (I believe these are typically 8mm)?

Peter

On the same subject, has anyone fitted them to a BSA Lightning XL. Rear sight easy but wondered if the 1/2 UNF thread on the moderator holds a clue.