Manual cam chain tensioners by Kreiger. These have an O-ring and matching chamfer under the locking nut to prevent oil from weeping past the threaded shaft. works great on the front, the rear required a very small wrap of teflon tape to be perfect. No secrets. I've included a pair of Honda OEM gaskets so you don't have to.
They are used. I put them on years ago when I purchased the bike. Don't need them any longer as I have done the "stopper mod" to a fresh set of auto CCTs.
$85 shipped anywhere in the contiguous 48 states.

 

OEM Stopper Mod?

I think I remember how it's done but could you please refresh my fading memory.

And it's just as good and safe as a set of Krieger or APE?

Thanks

 

I certainly hope so. Time will tell.
The procedure is somewhat lengthy, so follow this link for the full discussion.
CCT (Cam Chain Tensioner) Fail Safe Mod. (aka Stopper Mod) - VTR1000.ORG