I dont have pics, but if someone would like some i can get them up...
I made a tire grooving stand, for cutting grooves in dirt track racing tires. Usually I had to sit in a chair, hold the tire between my legs, and groove about a 6 inch area, then spin the tire some and do it again. But, this year I took an old rotor, with my bolt pattern on it, welded a bolt to my overhead hoist, then took a big washer and welded it to the bolt. Next i took the rotor, with the bearing still inside, and stuck it over the bolt. The rear bearings contacted the washer, then took another washer for the front, and put a nut on the bolt. Now i can stand while i grove tires, and just spin the tire a little bit! Took a 30 min/tire job and turned it into a 5 min/tire job! Also works great for siping, and grinding the tires!!
Also, we had to pull the trans out of the car alot this year, 3 speed saginaw. So we took some 6 inch long bolts that fit the bellhousing where the trans bolts up, cut the heads off and then ground the ends round! now we just stick the trans up, and use the bolts as long dowel pins! makes putting a trans in A LOT faster!
Then for speedy pit stops, i took my 1 inch impact socket, and spot welded a light valve spring inside, so when the nut comes loose, you pull the socket away and the nut pops out of the socket!
We also have put a skid on our jack, to aid in manuvering on dirt, ran a controller from the valve up the handle so we dont have to take the handle off to let the car down, and put a big foot on the lifting part of the jack to keep the car stable during a fericious tire change!