Yes, definitely take Machine up on his offer. Between his and your MC, you should be able to assemble one good one. This is the off season so you've got time on your hands. I wouldn't rush into buying a bunch of brake parts just yet, you may not need hardly any. Like has been mentioned, a thorough cleaning works many times without needing to replace any parts. To get the snap ring out of your MC, many just buy and mod (if need be) a cheap pair of needle nose from HF. Who knows, you may not need to grind the tips at all, they may fit just as they are ......
https://www.harborfreight.com/5-34-...MIqLLixYbi7QIVCQCGCh2wswkAEAQYASABEgLjcvD_BwE
What you will want to replace are the brake lines. Most of us do away with the 2 lines and splitter block, using one long line in their place. These stainless lines are dirt cheap on eBay now (less than $10). All you'll need to do is determine the length you need. You've made no mention of replacing the handlebars. Although yours don't look stock, they are still rather high. Many of us change to a lower, more normal height bar. Not only does this improve the look of the bike (in my opinion) but more importantly, it improves the steering "feel" and input. Here's my '83 as I got it (stock "buckhorn" bars) and after changing to lower Euro bend handlebars. With the lower bars, a 90cm long line works well .....