Crown/Samducksa's delve into the joystick lever accessory market starts with the fundamental ball top and bat top, available in several colors.
Fits Crown Levers with Detachable Accessory
These accessories are designed to fit Crown's newer joystick levers that allow you to remove the existing battop from its shaft, such as:
Counterbore in Balltop
Each balltop in the Crown family has a counterbore, or a small recess at the underside. Often a counterbore is designed to sit lower on the shaft, partly over the shaft cover. While tests done while installing the balltop on Sanwa JLF with shaft cover didn't create a complete cover, it should serve well for the Crown family of joystick levers and represents one of the few brands that offer a counterbore in the balltop.
Thanks to Discord's KlatuVerataNiktu for information regarding the counterbore feature.
Wide Compatibility with Sanwa and Seimitsu Joystick Levers, Crown Conversion Shaft
One notable feature of these accessories is its compatibility with the M6 threading found in Sanwa, Seimitsu, and Hori Hayabusa joystick levers. Additionally, you can use the Crown JLF Conversion Shaft to install them onto Crown 303, 307 and 309 models. Other unlisted joystick models that accept the Sanwa threading will also work.