With the importance of pressing the wrist pin either in or out, it would seem better to use full floating wrist pins, secured with EITHER Spirolox retainers OR Waldes Tru-Arc retaining rings. I realize that in order to use retaining rings, the pistons would need to have the retaining ring groove machined in the pin bore, whose dimensions (width, diameter and location) would need to be determined ahead of time. Some people prefer a Spirolox ring or others prefer the Waldes Tru-Arc type (usually 2 per groove per side to prevent push out). The only special tools required are the appropriate snap ring tools.
Out of curiosity, what is the advantage or dis-advantage of either method, other than perhaps a slight weight difference, due to the retaining ring(s) weights. Personally, I would prefer the retaining ring method....comments?
BOB RENTON