I was unable to log on for several days - I had that "Sorry guest, you are banned from using this forum. This ban is not set to expire" message. Still can't get here with Chrome so have switched to Win Explorer.
Steve - I'll let you know how that silencer sounds as soon as I get the job done. The engine's currently in bits in the shed but hopefully next week some time.
Dan - I'll post progress report on the 535 upgrade in a new thread