Glynn-821426 Posted August 6, 2021 Share Posted August 6, 2021 Hi,I have a Railroad Mallard TTS about 6 months old anyone know what size the screw is that holds the front of the body to the chassis. It's dropped out somewhere so need a replacement. It's a parallel thread into a brass bush in the body.Is there a pack of various screws that are used on locos available to buy?Moderator's Note: Title amending to aid any future search. Link to comment Share on other sites More sharing options...
atom3624 Posted August 6, 2021 Share Posted August 6, 2021 There is.Try to find the Hornby Service Sheet which relates to your model - do you know the model reference, eg R1234?Going Spare will be along shortly, doubtless - not volunteering his services, just a very knowledgeable and helpful person in these specific circumstances!Al. Link to comment Share on other sites More sharing options...
Glynn-821426 Posted August 6, 2021 Author Share Posted August 6, 2021 R3395 TTS Hornby OO Gauge RailRoad LNER 4-6-2 'Mallard' A4 Class with TTS SoundThe service sheet I have found shows the screw but no other infohttps://support.hornby.com/hc/en-gb/article_attachments/360016258920/hss_344railroad_a4_1_1.pdf Link to comment Share on other sites More sharing options...
ColinB Posted August 6, 2021 Share Posted August 6, 2021 It should be an M2 parallel thread screw. It might have a step on it but it probably doesn't matter People are always on about screw packs, generally Hornby have run out, the Service Sheet generally doesn't say what thread it is. I get mine from https://www.laptopscrewsdirect.com/ they do decent screws and you can choose your length. If not, use EBay and buy a pack of 50 from China. It might be a M2.5 but on all mine they are M2s. Hornby generally use either M2 or M2.3 self tapping screws, or M2 parallel thread. I got this info by basically measuring them when I was rebuilding a loco. If the loco is older they were still using 6 ba and 8 ba screws, but you loco is relatively new. Link to comment Share on other sites More sharing options...
sagaguy Posted August 6, 2021 Share Posted August 6, 2021 Be careful here, modern Hornby use M2.2 screws in assembling some parts of the chassis.These are practically unobtainable in the UK. You might get them from a Chinese supplier on Ebay.Ray. Link to comment Share on other sites More sharing options...
ColinB Posted August 7, 2021 Share Posted August 7, 2021 So far all the parallel threads on my Hornby locos are M2 or M2.5, but I am not surprised that they use M2.2, which I assume are the self tapping screws. You get get all sorts from China and just lately they Ship really fast.Thanks for the info on the M2.2, I knew they were bigger than M2, but I just assumed that they were M2.3. Either way other than "Laptop Screws" generally I have found that they all come from China, the UK outlets are not interested in small quantities. Link to comment Share on other sites More sharing options...
sagaguy Posted August 7, 2021 Share Posted August 7, 2021 The ones i`ve come across on the latest Hornby Spamcans are machined threaded screws.The also strip quite easily if not careful. Ray. Link to comment Share on other sites More sharing options...
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