I currently use the Karve handle with the head off of my Gillette Heritage razor, and it fits it perfectly.
I'm wanting to get a spare R89 type head (as I believe the Gillette Heritage has an R89 type head) as I find its an excellent razor to use with the Karve handle.
The Karve handle has a 10/32 threading (confirmed by Karve on their website).
I was wondering if anyone uses an R89 type head with the Karve handle or could recommmend an R89 type head that would definitely fit the Karve handle.
Thanks, but I already have a Karve head. I really like the R89 type head that Ive been using with the Karve handle and wanted to get a spare R89 type head.