Thighmaster area has a popular namesake boulder problem named Thighmaster V4 but the area also has other test pieces including Black Mark V4.
North of the Titanic area, park at the upper climber lot and enter the main trail. Take a left at the fork which will take you to the Black Mark boulder in the Thighmaster area.
Here you can add a new climb to the Sendage database.
Please do your best to keep the Sendage database free of duplicates.
Only create a new entry if you can't find the climb in the search results.
If you don't agree with the grade, suggest a new one when you tick the climb off.
Don't intentionally misspell the climb to change the grade!