So I've been enjoying my first pin, WOZ, for a few months now and love it. This is my first machine and I have some basic questions and want some advice.

So far there's been minimal issues. One of which occurred last night when one of the rubber rings by the witch split and came off. Not a big deal obviously except I realized I didn't have an inventory of basic parts on hand to fix minor problems like this. From WOZ and non-WOZ owners, what basic parts should I stock up on (rubber rings, screws, flipper bats, coils, etc.?) and where is the best place to get these? I'd much rather be oversupplied and able to repair and get back to playing asap.

Another extremely newb question (sorry for the stupidity!) is where I find the parts using the JJP provided part # from the WOZ manual? An example is the rubber ring in question - (part #25-6003-07-0). When I Google this part # the only result i get is from the manual on JJP's site.

Lastly, the "E"- in the RESCUE mini playfield - (switch 70) is not working. Any advice on a quick fix?
Am I correct that I use a tool like the "Ultimate Leaf Adjuster Tool" from pinballife to try and resolve this - or am I dead wrong? Also, I realize this tool is just that and I could surely use something else around the house to the same result.

Again, sorry for the extremely newbie questions but everyone starts somewhere, right?

Many thanks in advance.

Thanks wtatumjr, I'll try that tonight.