I ordered a 7900 conversion for my makita 6401. I have never work on a 2 stroke before but have a little experience with 4 stroke atv's and very rarely leave anything stock, its been a problem for years. 1. When I assemble the piston/cylinder do you have to check ring end gap. I don't think you could because the head is not removable like on a four stroke? 2. I dont have a ring compressor can I use a zip tie or any other makeshift idea's you have done? 3. I am not going to woods port because I don't know how to use a degree wheel and I have read the 7900 doesn't always respond well to mods like husky and stihl. But could I just clean up the ports from casting imperfections and maybe explain how to widen ports or just leave well enough alone, or if anyone would be interested in me sending them the cylinder for minor mods, I have it muffler modded already. 4. I already have a tach and can tune the carb pretty well after the muffler mod. 5. What if any other tips would you recomend for a first timer who is somewhat worried about screwing up his saw. ex. leave a rag around the lower end incase a clip fall in?