HI Ian,
I think by adding 5kg to the model with the original belts will be a big problem. Do you have the plastic belt pullies or the aluminium pullies? You may find that the belts will slip because they are only 3mm wide unless this has been changed. I changed mine to 4mm wide to give more area over the pullies with better performance. The chain is better again. Where did you get your chains from I got mine from TTM in Germany at a better price than in Italy. The extra pieces I have put on are from Leimbach purchased from TTM in Germany I have found the service from TTM 100%. The new grab will be shipped next week so it should be here and fitted in about 4-6weeks so will be able to give comment on the grab then. I think the people having problems loading onto the trailers may???? have the plastis pullies as I did. My machine number is 102 and as you may know the first 100 were pre ordered so my model was in the first run and had the plastic pullies. Ian how much of the model is complete?
If you look on youtube at titandigs you will see on of my vids showing the build process by still photos.
Paul