New bike no Exup

[Zundap]

So my exup assy arrived today, all looks good and came apart with not too much grief.
The only bit missing is the little spring which sits behind the pulley.
It's £4 new from Fowlers so can get one of them.


I have now found that on my bike there is no bush fitted in the exhaust where the valve spindle sits, opposite end to pulley.
This is OK because I have a spare bush from the combination of exup bits.
Is it just a matter of cleaning up the bush housing and the bush and it will just slide in or is it gonna be a twat to get in?


Should I put the bush on the valve end and try and fit or fit the bush on its own first?


Anyone fitted one before?


Cheers