This is the Top hat shaped rubber used on the bottom of Manx and Racing International Bolt-thru petrol tanks - With a larger diameter head than A11M/840 (Item 0131), It fits at the bottom of the tank and locates in the recess on the alloy Manx brackets used on Plunger Manx frames.
Price is each
Norton introduced the 'Bolt Thru' style of Manx Norton petrol tank for the postwar racing models (i.e. 46-47), as well as some Clubmans tanks, although they may have experimented with them just pre-War as well, and Works bike used this method of securing the tank. The petrol tanks had tubes running all the way vertically through them, and then recesses at the top to hold 4 smaller Top Hat rubbers (our Item 0131) and holes under the tank to push in four of these larger Top Hat type rubbers.
Through the centre then ran 5/16" steel rods - threaded at both ends, and with chamfered ends, with acorn nuts at the top (our Item 0125) and two 5/16" nuts under the frame tank supports which could be adjusted until the right tension was obtained, then locked together.
Lipped washers (our Item 0123) are then used both at the top of the tank (they slide over the smaller Top Hat rubbers) and underneath the tank bracket to support the whole assembly.
We have had the moulds made for these bottom rubbers, copied from original Norton items and they are made for us by a specialist rubber manufacturer from high quality oil resistent nitrile rubber of just the right density.
Fitting Notes: These bottom rubbers have a nice wide bottom area that sits nicely on the recess of the Manx Norton frame tank brackets (alloy in the case of the front bracket). However, if you wish to raise the height of your petrol tank slightly (as sometimes there are clearance issues it is also possible to fit a normal road type 'lipped' washer (Our Item 0128) in the recess of the frame tank support, with the large Top Hat Rubbers then sat on them .
Final point - some observant people will notice that the 1948 Norton Spare Parts list shows that the lowest rubber - that fits under the tank support is lipped, but small enough to fit into the 0128 lipped washer. Sorry - we do not sell these small lipped type - and have found that the normal washer (Item 0129) is satisfactory (as ours is of the correct size and density) - and its only purpose was to keep the centre rod centralised and avoiding it touching the tank bracket. Therefore, if using an extra lipped washer, this will occur anyway - and if not - it is a simple task to take a piece of fuel line and cuts it to approx 5mm length and feed it into the recess in the tank bracket to achieve the same purpose - if this makes sense!
Shown in the photo are two genuine Manx petrol tanks - a steel scolloped/soldered tank (the first bolt-thru type offered, and the later alloy petrol tank - fitted in 1949/50. There was also an interim type - similar to the scolloped type, but of welded construction, in approximately 1948-49. All three types use the rubbers shown here.
Your basket is empty.
