On my PDQ I installed a short length of pipe to hold the winch handle used at the mast. It was attached with screws.
The canvas holder on my F-24 finally died from sunburn, so came up with a new version. This time it attached with VHB tape and is cut on an angle to hold the handle against the bulkhead. It's cut high enough that there is toe clearance under it.
I considered commercial units, but none were designed to fit tight in the corner. I considered Velcro, but this seems more secure. The only down side is that it does not accept floating handles (too fat).
See the full story on winch handle holders in Practical Sailor Magazine.