Start following MBR, but after false teeth-bugsy, turn right along the river, then right up the next fire road. Will plop you out at the bottom of the steep tarmac climb upto the Adams Family descent. Joins back up nicely at the bottom of the short climb before Pink Heifer.
Couple of weeks ago there was a bit of the Adams family closed for forest works, if you head right it takes you back round for another bash at false teeth, then scoot up the fire road, past bugsy to join the last section.
Penmachno is definitely worth your time, if you’re over that way. Ace wee loop, particularly now all of the last bit is open again.