Post by silverbullet on Apr 19, 2020 21:18:56 GMT
Thanks for adding to the accumulation of PB info Bones. It appears you left off the most important page....the TNT page, lol ! If it's simple enough to add to your post that would be great.Below are a few pictures of PB clutches I have picked up at swaps over the years.
First picture: is of the 3 aluminum units I have, only two have the inner fixed sheave and they are both taper shaft units, not thread on. Includes notes on observed differences.Differences that have me scratching my head is the square vs bevelled shoulder as well as he smooth walled outer cup.
Second picture:is of the corresponding outer cups of the 3 aluminum clutches.
Third picture: is of the older steel clutches. The PB and the Eastern Industries units share the same patent numbers and I wonder if the Eastern unit is a predecessor to PB? The steel 4 puck PB unit I have is a thread on and was pulled from a 73 340 silverbullet I scrapped. But as noted above, there is no interchangeability between the steel and aluminum units except as noted in fourth picture.
Fourth picture: is of the pucks from inside the steel clutches. Except for the company name they are identical. The steel 3 gram calibration weights and their threaded nylon caps are interchangeable with the later PB aluminum clutches.
Fifth picture: An explanation of the spring part numbers. I was able to use a micrometer to measure wire thickness, spring length and OD to identify some of the rusty springs inside these. Also noteworthy is that the 1978 parts catalogue shows many colours of springs being available, each colour being a different wire thickness and or spring length. The 1988 catalogue only identifies grey or black springs of varying length and wire thickness; the grey springs all being .218" wire x various lengths; the black springs being .244" wire x various lengths. So if the spring of the unit in your hand is rusted/colourless, it's possible to take some physical measurements to see if you can cross reference the spring in hand with the parts catalogue.
First picture: is of the 3 aluminum units I have, only two have the inner fixed sheave and they are both taper shaft units, not thread on. Includes notes on observed differences.Differences that have me scratching my head is the square vs bevelled shoulder as well as he smooth walled outer cup.
Second picture:is of the corresponding outer cups of the 3 aluminum clutches.
Third picture: is of the older steel clutches. The PB and the Eastern Industries units share the same patent numbers and I wonder if the Eastern unit is a predecessor to PB? The steel 4 puck PB unit I have is a thread on and was pulled from a 73 340 silverbullet I scrapped. But as noted above, there is no interchangeability between the steel and aluminum units except as noted in fourth picture.
Fourth picture: is of the pucks from inside the steel clutches. Except for the company name they are identical. The steel 3 gram calibration weights and their threaded nylon caps are interchangeable with the later PB aluminum clutches.
Fifth picture: An explanation of the spring part numbers. I was able to use a micrometer to measure wire thickness, spring length and OD to identify some of the rusty springs inside these. Also noteworthy is that the 1978 parts catalogue shows many colours of springs being available, each colour being a different wire thickness and or spring length. The 1988 catalogue only identifies grey or black springs of varying length and wire thickness; the grey springs all being .218" wire x various lengths; the black springs being .244" wire x various lengths. So if the spring of the unit in your hand is rusted/colourless, it's possible to take some physical measurements to see if you can cross reference the spring in hand with the parts catalogue.
