Question, does anybody know which exact dunlop reference the dingwall strap locks are ?
I see several on thomann but none seem to be an exact match.
Ideally I would like to be able to use the same strap on at least another bass (which has non-locking thingies for the moment).
Also I suppose the screw which fixes the locks into the horn never got its diameter/depth standardized, right ?
Can one reuse the current screw with any type of straplok or will diameter maybe prevent that ?
The hardware that goes onto the strap is the same for all Dunlop models. The only thing that is different is the color of the finish.
There are two different versions of hardware that goes on the bass:
One is known as standard or traditional or dual design, which sticks out from the bass, so you can use any strap that does not have hardware on it, in addition to using a strap with Dunlop hardware.
The other is called flush mount. These do not stick out from the instrument, and you can only use a strap that has Dunlop hardware with it. It requires a more complicated process to install, because you have to drill two holes, first a hole for the screw, then a bigger shallow hole for the cup. Having a high quality and very sharp Forstner bit of the correct size is very helpful for drilling a flat-bottomed hole for the cup, especially on a bass that has a painted finish that can chip if you use a cheap quality drill.
Both versions use the same screw though.
The threads on Dunlop screws are not identical to the threads on Schaller screws, and they also may not be exactly identical to the threads on your factory screws. So it is extremely important to be very careful to make sure that you follow the instructions exactly that come with the Dunlop hardware, and you might need to put a small sliver of wood into the hole along with some glue, or take other action depending on what you have done in the past with your screw holes, in order to make sure that you have a completely solid installation that will never pull out. The risk of disaster is low, but the impact of disaster can be extreme, up to and including some very serious damage to your instrument if it unexpectedly falls while you are jumping around on stage. So this is not an operation that you want to make a mistake on when you change your strap buttons. If you are not completely certain you know what you are doing, it is best to get professional help so that you have a solid installation that won't pull out, and so that you don't split the wood.