Glenn Van Looy Adjustable Bottom Cap for Euphonium Used item. Purchased approximately two years ago. This is a heavy bottom cap (Adjustable Bottom Caps) for euphonium, supervised by Glenn Van Looy, a euphonium player. This product is compatible with German-made Besson euphoniums. It is installed only on the 4th piston. The bottom cap can be disassembled, allowing you to adjust the resistance by adding or removing weights. For more details, please refer to the manufacturer's website below: https://www.heavybottomcaps.co.uk/glenn-van-looy-abcs For reference: The new price seems to be £78.95 + shipping from the UK £16.82 = £95.77. Approximately 19,102 yen as of September 27, Reiwa 7 (2025).