Thanks for the explanation. Dad said the few Construction companies here all used TD 18's. My neighbors in the day had 12 of them and pulled pans. After he sold out and retirted they sold parts all ocver the country. Bonds used use them alot. Dad said Tom and travis bonds had one when working for their brother. He said it was hard to start and they had loaded it on the lowboy and pulled the blade up the the gooseneck. Dad told me they had left it running and had the clutch knuckled out to let it run. Then they chained it through the draw bar and took off to a site down the road they went undder a few low branches. Then they felt something and looked back and saw the old 18 comming up the gooseneck to the cab. they think the limb let the clutch engage. Dad asked Mr. Tom what they did and he looked at him and said we just got out of the truck no stopping just got out. Dad started out on a TD18 with the B&E blade that had the outside arms. He said it was teribbly slow and if you made wave you had to start somewhere esle because it wouldnt catch itself.