ER-40 Collet Chuck(s)

impressive work! this has given me an idea for my old black and decker valve grinder. it has some wierd kind of double angle collet which i cannot find stocked anywhere in the country, even the specialist supplier i called offered to buy the only one i had! i i could convert to ER type (probably ER32 or even ER16 would do it) i would have plenty of collets for all the sizes i need. 4 valve motorcycle valve stems are tiny, and my collet is good for 6mm to 8mm
 
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