I think you haven't read my very first post in this thread. The whole idea of this hack was to pimp up a cheap Chinese thumbwheel switches from ebay (i guess they are a knock off of some brand, what else?) which otherwise i would thrash and generate more e-waste, definitely it wasn't to build the worlds best piece of art resistance decade box.
Thanks to Dave, the idea evolved into making a make-before-break version, which in my opinion made this hack even mode useful.
I also mentioned the size of the switches, i don't understand how it comes as surprise to you now.
Removing the pcb from the switch requires to cut off three posts, but the new pcb, once pushed in sits tight. Definitely not going to come off due to the force generated by the spring contact. If that's not enough, a very tiny drop of gel superglue will secure the spots.
I have built two decade boxes using these modded switches now, they work ok. Maybe they won't last forever, but for the price - that's ok.
If you prefer to make a relay based, mcu controlled decade box, which you can be proud of, there is no point in modding these switches. There is no point in using them at all.
This is a quickie project using cheap parts with the intention to make the best out of them.