42mm GM SL Scale Spinner (No Collet)

I have used these beautifully hand crafted spinners for a few years, they are safe to use on high power 10s set ups with 16x10 scale blades in a 5m span ASW27..also on the front of a Prismaray using a 6s Hacker geared motor which provides a secure and smooth transmisssion of 1500watts. The GM blades are sturdy too,yes the set up is expensive..I have used less robust & quality items and lost a prop ..devastating consequences & also the whole drive assembly on a Thermic XLdue to poor grip to the prop shaft due in turn to lack of precision in the making..GM spinners do not let go ..you tighten the front domed screw you get corresponding healthy and safe contact onto the motor shaft..peace of mind & you have taken responsibility to the ultimate degree..I will not buy anything less in these applications..Swiss made I believe..ummmm, you can feel and see the difference...worthy investment to get the already expensive project looking just right too..