The upper joints were in good condition and have been mounted again after the checks and cleaning.

The lower joints were broken so that they have been rebabricated.

A joint SKF has been utilized, chosen from the SKF catalogue.

The employed type is manufactured by Nylon (or teflon) between the two parts (see drawing).

The capacity is 400/450 Kg each, that is enough for the weight of the front part of the 7A on each wheel.  

A ring has been constructed to be fitted inside the joint. The internal surface has been worked in order to have the required conicity.