Getting my new to me 73 Sunfish ready for racing. I am looking to replace the mainsheet cam cleat with a ratchet block like the Harkin H019 or H2625 Harkin CarboRatchamatic or Ronstan RF6100 60 MM Ratchet. What do I need to attach these ratchets to the deck? Eyestrap and stand up spring? Which eyestrap? Vanguard V79460? Other? Does one eystrap fit the three ratchets Which stand up spring(s)? H071? Other? Sorry for so many questions. I've never modified my daysailing boats and just used them as they were. I am looking forward and anxious to any and all of your help and suggestions.