Firstly Thomann is THE only place I've found that sells these near-on-impossible to find spacers and washers, after years of searching one day I just stumble upon these while browsing for other parts....imagine my delight!
I like to have my tuning buttons screwed in reasonably tight to help with tuning stability but this has it's downsides namely even the slightest overtighten can result in the plastic spacer/crush washer splitting, therefore coming off as you tune up, especially in vintage guitars where the plastic/nylon slightly degrades.
I have a box half full of donor tuning pegs which hace keept me in (used) replacements...until they ran out and I had to manage with tuning pegs looser than desirable, well no more!! I can testify t0 the quality of these Goeldo parts as I've installed them on 3 tuners now and they fit perfectly, turn smoothly and are made of what seems very durable nylon/plastic.
Very happy!