Accessory Tripod Mounting Spacers from Sunwayfoto

As I had commented in the Sunwayfoto DYH-66i Leveling Base Review ("Mounting on a Tripod" section) there was an issue with the depth of its bottom mounting hole which would generate problems and frustration to users if their tripod mounting stud exceeded 6mm in height.

Owners of tripods with an adjustable (usually the reversible type) mounting stud would not face any problem, but there is always the case of those that their tripod stud is fixed or those that do not know or plainly do not want to adjust it.

Desmond DTR-1 Tripod Reducer-Spacer Review

While it is quite easy to convert an 1/4"-20 thread to a 3/8"-16 thread by using an appropriate conversion bushing the opposite is quite more difficult.
Nowadays, many tripod top mounting plates are equipped with a reversible stud which has both 3/8"-16 and 1/4"-20 threads, one at each side.