Can I Fix These Portable "Shoebox" Cassette Players?

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Brace yourself for 57 minutes of mind-numbing nerdiness. Imagine how bad it was editing this!

I was given these two cassette players, the Harvard Elegance Mk II and the Sanyo Slim 11. I do my best to fix them in this video.

You can also put a few pennies in the kitty by buying my stuff on eBay: https://www.ebay.co.uk/usr/kartingcol

Treat yourself to the screwdriver set I use, the iFixit Minnow Toolkit: https://amzn.to/363wKUF
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Chapters
00:00 Intro
00:52 Sanyo Slim11 testing and features
04:39 Harvard Elegance Mk II testing and features
10:31 Estimated Repair Cost
11:01 Further testing
11:35 Hardvard repair attempt, including:
14:00 A question for the electrical experts (only)
16:53 EBL C-Size Spacers Battery Adapters
22:50 IMPORTANT WARNING
24:23 Sanyo Repair, including:
39:05 IMPORTANT WARNING (again)
42:08 New pinch roller cleaning technique
47:17 Cleaning the play head and capstan
51:30 Headphone test
52:35 Reassembly
56:16 Final test