I too had a shutter release issue on my X-pro3 whereby the button was hard to depress and there was no ‘half press’ stage so - nothing ventured - I used graphite powder around the switch and then screwed the red plunger accessory button back in and used that to manipulate the shutter in order to get the graphite powder into the switch mechanism and basically my shutter release is good as new and I can hear the first click of the half press and the button continues to the full press.
**Graphite powder is a conductor and also a very good dry lubricant**
You can probably purchase graphite powder but I made mine (the old fashioned way) by sharpening a pencil to expose a long slither of Lead and then scraped the lead with a sharp modelling knife such that the graphite powder fell around the shutter button and then used a tiny paint brush to build up the graphite around the circumference of the shutter. Then I re-attached the red shutter button attachment and agitated it every which way until the lubricant did it’s job.
