The 'bolt rig' sounds similar to a couple of rigs used here in the PNW. The general term is "Plunking." The term 'plunk' refers to the sound of the lead weight hitting the surface of the river.

Couple of ways this is done, and both (in moving water) are highly effective. To back up a bit, 'plunking' is done by river bank fishermen waiting for steelhead/salmon moving up stream by their position. First way is to attach a large three way swivel on the end of your line. (Think of the letter 'T.') The bottom ring gets an extra foot or two of heavy leader to which a heavy sinker/lead is attached. From the remaining (shaft of the 't') regular leader 2-3 foot long is attached and to the end of the your 'lure' of choice.

You chuck the whole mess out, the lead grabs the bottom and the 'lure' is suspended 6 to 12 inches above the bottom moving about in the current. Pour coffee, sit back, bull shxt with the guys next to you ... etc., and etc.

The second 'rig' is more frequently used in deep moving water slots. In this case just a regular barrel swiv. is used with the line attached to the top, a couple of feet (to as much as three) is tied on below, the lead weight attached to that. Now comes the fun part. You take a snap-swiv. and attach a couple of feet of regular leader material, and on the end of this a 'diving plug' such as a 'hot shot,' 'quick fish,' 'wee-wart,' (think thin cross section -diving lipped Bass Plug), etc.

The lead is cast out into the current, water speed will drop this below you at a 30-45 degree angle. Lead hooks up on the bottom and now your ready to attach the 'diving/wiggling plug.' The snap swiv. is clipped over the main line and water pressure will pull the plug down the line until it hits the barrel swiv. above the lead. Plug starts to 'wiggle/dive/etc.,' and now you pour the coffee, sit back, bull shxt with the guys .. and wait. Same idea from this point on waiting for moving fish to swim by and get ****** off and chomp the plug.

Don't fish this way, but on the Chetco River (Brookings, Oregon) there's one long gravel bar (probably 7-8 hundred yards long over-all) called "Social Security." This is where all the 'old-timers' go in the morning .....