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Terry,
With respect, the skirt-less T-shaped thumb screws were used only on early '35-'36 open cars. They were replaced with round-headed thumb screws (with cross hatched perimeters), with part numbers 48-743188 and 48-747156. They initially had relatively small diameter heads which were subsequently increased as a running change (evidently without a change in part numbers) to the size of the thumb screws in the photo in #4 above. I don't recall the small head version ever being reproduced, unlike the large head version shown in that photo.