I have an older b and d leaf blower , i need to find out what makes the proplellar turn a different way , to go from vacuum to leaf blower ? tks it a b and d bv 2500 type 3

If your blower is not manufactured to be convertible you won't be able to make it into a vacuum. The turbine will not withstand the force of the debris entering it and will be destroyed quickly and could even come apart forcefully injuring you and others around you.
Now if it is designed for vacuuming, the air intake will have a cover that can be opened and allow for the vacuum tube attachment to be connected there. The turbines on these types of blowers are made of materials that can withstand the debris that will be flowing through it and some even have a metal blade that grinds the debris before it enters the turbine then the debris will flow through the outlet tube where the air flows through that blows the leaves and into a bag or filter top that connects to a trash can. Now if this is something that you just have to do and the blower you have isn't a vacuum it can be done but use EXTREME caution. And some pretty major modifications will have to be done to the frame and body of the blower. Some blowers have safety switch's that will prevent the motor or engine from running if any modification is made or if debris is entering the turbine so be prepared for these. I recommend not doing this. If your blower is not manufactured to be convertible you won't be able to make it into a vacuum. The turbine will not withstand the force of the debris entering it and will be destroyed quickly and could even come apart forcefully injuring you and others around you.
Now if it is designed for vacuuming, the air intake will have a cover that can be opened and allow for the vacuum tube attachment to be connected there. The turbines on these types of blowers are made of materials that can withstand the debris that will be flowing through it and some even have a metal blade that grinds the debris before it enters the turbine then the debris will flow through the outlet tube where the air flows through that blows the leaves and into a bag or filter top that connects to a trash can. Now if this is something that you just have to do and the blower you have isn't a vacuum it can be done but use EXTREME caution. And some pretty major modifications will have to be done to the frame and body of the blower. Some blowers have safety switch's that will prevent the motor or engine from running if any modification is made or if debris is entering the turbine so be prepared for these. I recommend not doing this.

If your blower is not manufactured to be convertible you won't be able to make it into a vacuum. The turbine will not withstand the force of the debris entering it and will be destroyed quickly and could even come apart forcefully injuring you and others around you.
Now if it is designed for vacuuming, the air intake will have a cover that can be opened and allow for the vacuum tube attachment to be connected there. The turbines on these types of blowers are made of materials that can withstand the debris that will be flowing through it and some even have a metal blade that grinds the debris before it enters the turbine then the debris will flow through the outlet tube where the air flows through that blows the leaves and into a bag or filter top that connects to a trash can. Now if this is something that you just have to do and the blower you have isn't a vacuum it can be done but use EXTREME caution. And some pretty major modifications will have to be done to the frame and body of the blower. Some blowers have safety switch's that will prevent the motor or engine from running if any modification is made or if debris is entering the turbine so be prepared for these. I recommend not doing this. If your blower is not manufactured to be convertible you won't be able to make it into a vacuum. The turbine will not withstand the force of the debris entering it and will be destroyed quickly and could even come apart forcefully injuring you and others around you.
Now if it is designed for vacuuming, the air intake will have a cover that can be opened and allow for the vacuum tube attachment to be connected there. The turbines on these types of blowers are made of materials that can withstand the debris that will be flowing through it and some even have a metal blade that grinds the debris before it enters the turbine then the debris will flow through the outlet tube where the air flows through that blows the leaves and into a bag or filter top that connects to a trash can. Now if this is something that you just have to do and the blower you have isn't a vacuum it can be done but use EXTREME caution. And some pretty major modifications will have to be done to the frame and body of the blower. Some blowers have safety switch's that will prevent the motor or engine from running if any modification is made or if debris is entering the turbine so be prepared for these. I recommend not doing this.