As long as the 3/16 flex cable has some wall play in it ( not tight ) you will be fine there is a .037 difference between 150 and 187 What is the ID/inside diameter of the brass ??
1/4" is too big for .187 flex IMO, 7/32 is perfect with no teflon liner. What i have done is just put some epoxy on the outside of the 7/32 and stuff it inside the 1/4" its a perfect fit.
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