Welcome @Wellsyboy, I'd recommend that you simply listen to the music you like and pay attention to the bass parts. The likes of Jaco, genius though he was, are not a great starting point for a study of bass, there's are some amazing bass parts hidden in some otherwise quite ordinary songs. Good luck 👍
So, metal polish ordered, next job is to identify which of the screws is rattling, which I suspect is going to go hand in hand with replacing the old, ugly and rusty flat-head screws with some nice, new and shiny cross head equivalents 👍
Yep, we hear with our eyes and our emotions more than we realise. I get it with strings a lot, swear I can hear a nasty overtone but in reality my brain’s focussing on and unconsciously amplifying a very small part of the overall sounds making me irritable and causing a viscous circle 👍
As above really, I’m messing with some bitsas, can I use a hand-held such as this?
https://www.toolstation.com/dewalt-dcw604nt-xj-18v-xr-brushless-14-router/p75238?store=E1&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&mkwid=_dm&pcrid=&pkw=&pmt=&gclid=EAIaIQobChMI5o7-x9nj_AIVh7btCh130AV3EAQYASABEgLCiPD_BwE&gclsrc=aw.ds
Wish I looked that cool when I get cramp, got finger cramp at a gig just before Xmas (stupidly experimenting with short-scale) and apparently looked like I'd forgotten how to play