Ill try to make this clear when I talk about (Gap) I mean the space between the clutch shoe and the inside of the clutch bell were the clutch shoe contacts when engaged. (Endplay) Is the length of total movement that the clutch bell has when pulled in and out. The kyosho manual tell's you to set 0.5mm (Endplay) what I do is transfer that 0.5mm from (Endplay) into (Gap). You use a combo of gap distance and spring tention to get the desired clutch feel Depending on the type of spring the spring tention distance can veary as much a 1mm because some springs are shorter and some are longer. For a kyosho 4d clutch spring 1mm spring tention is a starting point the gap just delays the engagement further. when people build a clutch with no gap and litle (Endplay) the only thing you have to delay the clutch engagement timing is spring tention. This will do one of 2 things and some times boath rob your engine of paformance and make a very boggy feel to the engine and i have seen people try to make an engine run better by leaning the engine with no gain just unnessary engine ware. The second is you will have to put so much tention on the clutch spring that the clutch will slip that ends up wareing your expencive clutch shoes when they would normaly last a very long time depending on coumpound they are made of. Its a very good idear to have lots of 5x7mm shims to set a clutch kyosho make a shim kit that has 0.1mm 0.2mm and 0.3mm 5x7mm shim's and lots of them I will post the part number soon they are very good and great value for what you get. Best Regards Jeremy.