Gurley Tripod

Check ebay. They have gotten pricey now that it is chic to re-purpose them for lamps.

Seco adapter

https://surveyingsupplies.com/seco-tripod-adapter-5-8-x-11-to-3-1-2-x-8-2130-00/?gclid=Cj0KCQiAm4TyBRDgARIsAOU75sqv7MCvoReafzd4zcYP_xLjsHw5ccFxwdHwsz3fjJhUP8TFRdTlJxsaAl_aEALw_wcB

My rambling thoughts. If you use the seco adaptor above, don't throw that transit on your shoulder. The bell housing bracket on modern tripods may not be adequate in construction, although they vary in strength.?ÿ

@spmpls You seem to be right on. I will need to shell out about $200 to get one. At least, I found out that my transit is worth more than I thought. My Father bought it from a Farmer in Mississippi for $68.50. He wanted $75.00.