COIN MECH SOLVED!
As mentioned in an earlier post, the original coin mechs (Asahi Seiko KWM/740) were thrashed. I spent a countless amount of time trying to track these down. I ordered new plates from Mike’s Arcade and they were too small. I emailed Asahi Seiko for information directly and they sent me back to Mike’s Arcade. It was a seemingly never ending loop of dead ends. Upon further research the best I could determine was Asahi made a variant labeled the “740-L” (presumably L for the face plate being longer) but finding more information on that was tough. I wanted nice shiny mechs without screwdriver scratches all over them, and I also wanted the machine to run on JPY (¥100) like other machines from that era in Japan. So I purchased some Asahi Seiko 730-A/B 100¥ mechs from Yahoo Auctions Japan for the low price of $4 each assuming I would have to fabricate a custom mounting plate for them. Once the mechs arrived I went into illustrator to begin redrawing the base mounting plate. I had the outer measurements from earlier work on this so this seemed pretty straightforward. Did a few iterations, cut by hand to test fit. Everything was looking good so I took the test print down to the cabinet for a final fitting and sure enough – it was the same size mech! TL:DR version: It appears that in the US, Sega used a 25$ Asahi Seiko KWM-740 mech with a modified or perhaps even custom faceplate. Size wise, the Asahi Seiko 730-A/B is the exact same. This is great news for all Super Hang On owners as the 730-A/B is still widely available in a variety of configurations for European, US and Japanese markets.
