I'm just now bumping up against a tool issue myself. I never intended to do anything but build the kit as supplied - until I looked more closely at where the kit was heading. Once I realized that the time investment vs end-product was out of balance I started making upgrades (which, of course, added more time). I am looking ahead at some of the bits and baubles that I might want to upgrade and realize I lack both the tools and the craftsmanship needed to meet my vision. But I'm motivated so maybe...Just did a side by side comparison with what the kit supplied...... I think the kit capstan is also a little too big....
I'll say one thing - the capstan you built is a marvelous improvement vs the one supplied with your kit. Well done!