It depends
Hello,
The thimble itself is the big variable. If it is too small, it is vulnerable to collapse and/or cracking. Too big, and it won't fit into the right size turnbuckle. This is why, for standing rigging, solid thimbles are preferable.
Then there's the relationship between thimble and wire. Especially with 1x19, the radius of the thimble might be less than the wire needs to avoid deforming/weakening in the bend. Which is why extra-wide-radius solid thimbles are preferable for standing rigging.
Most of the time, when people use thimbles, they seem to do so as a cheap expedient, and it usually works -- that is, doesn't fail immediately and catastrophically -- regardless of thimble size or type. But getting the lower terminal consonant with the rest of the wire is important.
In your case, you could probably tie a Bowline in the end of the wire and put it directly onto the turnbuckle clevis pin, with no problems; 3/16" wire on a 20ft. boat? Really?
Fair leads,
Brion Toss
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